user_id
stringlengths 24
24
| time
stringlengths 24
24
| feature_type
stringclasses 5
values | feature_version
stringclasses 2
values | input_question
stringlengths 1
1.24k
⌀ | input_code
stringlengths 2
18.5k
⌀ | input_intention
stringlengths 1
2.48k
⌀ | input_task_description
stringlengths 18
3.32k
⌀ |
|---|---|---|---|---|---|---|---|
63c647dc5f004bf4898cf752 | 2023-02-02T23:46:24.057Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
if (argc != 3) {
fprintf(stderr, "Usage: greeting message name\n");
return 1;
}
char greeting[20];
char *name = argv[2];
// Your code goes here
strncpy(greeting, argv[1], 20);
int len_greet = strlen(argv[1]);
greeting[len_greet + 1] = '\0';
strcat(greeting, " ");
strcat(greeting, *name);
printf("%s\n", greeting);
return 0;
}
| This program has two arguments: the first is a greeting message, and the
second is a name.
The message is an impersonal greeting, such as "Hi" or "Good morning".
name is set to refer to a string holding a friend's name, such as
"Emmanuel" or "Xiao".
First copy the first argument to the array greeting. (Make sure it is
properly null-terminated.)
Write code to personalize the greeting string by appending a space and
then the string pointed to by name.
So, in the first example, greeting should be set to "Hi Emmanuel", and
in the second it should be "Good morning Xiao".
If there is not enough space in greeting, the resulting greeting should be
truncated, but still needs to hold a proper string with a null terminator.
For example, "Good morning" and "Emmanuel" should result in greeting
having the value "Good morning Emmanu" and "Top of the morning to you" and
"Patrick" should result in greeting having the value "Top of the morning ".
Do not make changes to the code we have provided other than to add your
code where indicated. | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:28:07.849Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (*user_ptr_add->next != NULL){
if (**user_ptr_add == name){
return 1;
}
user_ptr_add++;
}
*user_ptr_add->next = malloc(sizeof(User));
*user_ptr_add->next->name = name;
*user_ptr_add->next->next = NULL;
return 0;
}
| /*
* Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator)
*/
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:30:49.195Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (*user_ptr_add->next != NULL){
if (strcmp(**user_ptr_add, name)){
return 1;
}
**user_ptr_add++;
}
*user_ptr_add->next = malloc(sizeof(User));
strcpy(*user_ptr_add->next->name, name);
*user_ptr_add->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:31:55.929Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (*user_ptr_add->next != NULL){
if (strcmp(**user_ptr_add, name)){
return 1;
}
**user_ptr_add++;
}
*user_ptr_add->next = malloc(sizeof(User));
strcpy(*user_ptr_add->next->name, name);
*user_ptr_add->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:33:17.137Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (**user_ptr_add->next != NULL){
if (strcmp(**user_ptr_add, name)){
return 1;
}
**user_ptr_add++;
}
**user_ptr_add->next = malloc(sizeof(User));
strcpy(**user_ptr_add->next->name, name);
**user_ptr_add->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:58:06.778Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (**user_ptr_add->next != NULL){
if (strcmp(**user_ptr_add, name)){
return 1;
}
**user_ptr_add++;
}
*user_ptr_add->next = malloc(sizeof(User));
strcpy(*user_ptr_add->next->name, name);
*user_ptr_add->next->next = NULL;
return 0;
}
| /*
* Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator)
*/ | null |
63c647dc5f004bf4898cf752 | 2023-02-08T02:59:50.611Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (**user_ptr_add->next != NULL){
if (strcmp(**user_ptr_add, name)){
return 1;
}
*user_ptr_add++;
}
**user_ptr_add->next = malloc(sizeof(User));
strcpy(**user_ptr_add->next->name, name);
**user_ptr_add->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list * of users whose head is pointed to by *user_ptr_add. * * Return: * - 0 if successful * - 1 if a user by this name already exists in this list * - 2 if the given name cannot fit in the 'name' array * (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T03:08:09.227Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while (*user_ptr_add->next != NULL){
if (strcmp(*user_ptr_add, name)){
return 1;
}
**user_ptr_add = **user_ptr_add + sizeof(User);
}
*user_ptr_add->next = malloc(sizeof(User));
strcpy(*user_ptr_add->next->name, name);
*user_ptr_add->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator)
| null |
63c647dc5f004bf4898cf752 | 2023-02-08T03:17:11.195Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp(*user_ptr_add, name)){
return 1;
}
**user_ptr_add = **user_ptr_add + sizeof(User);
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T03:18:49.979Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name)){
return 1;
}
**user_ptr_add = (**user_ptr_add)->next + sizeof(User);
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T03:20:15.525Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) i{
if (strlen(name) > 31){
return 2;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name)){
return 1;
}
**user_ptr_add = (**user_ptr_add)->next + sizeof(User);
}
(**user_ptr_add)->next = malloc(sizeof(User));
strcpy((**user_ptr_add)->next->name, name);
(**user_ptr_add)->next->next = NULL;
return 0;
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T03:38:52.214Z | Help Fix Code | v1 | null | User *find_user(const char *name, const User *head) {
struct User *temp;
*temp = *head;
while (*temp != NULL){
if (strcmp((*temp)->name, name) == 0){
return temp;
}
*temp = (*temp)->next;
}
return NULL;
}
| Return a pointer to the user with this name in
* the list starting with head. Return NULL if no such user exists.
*
* NOTE: You'll likely need to cast a (const User *) to a (User *)
* to satisfy the prototype without warnings. | null |
63c647dc5f004bf4898cf752 | 2023-02-08T04:01:53.435Z | Question from Code | v1 | The code is giving a segmentation fault. The code should Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator)
| int create_user(const char *name, User **user_ptr_add){
if (strlen(name) > 31){
return 2;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name)){
return 1;
}
*user_ptr_add = (*user_ptr_add)->next;
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
return 0;
}
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-08T04:20:22.105Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add){
if (strlen(name) > 31){
return 2;
} else {
while ((**user_ptr_add)->next != NULL){
if (strcmp((**user_ptr_add)->name, name)){
return 1;
}
**user_ptr_add = (**user_ptr_add)->next;
}
(**user_ptr_add)->next = malloc(sizeof(User));
strcpy((**user_ptr_add)->next->name, name);
(**user_ptr_add)->next->next = NULL;
return 0;
}
}
| Create a new user with the given name. Insert it at the tail of the list
* of users whose head is pointed to by *user_ptr_add.
*
* Return:
* - 0 if successful
* - 1 if a user by this name already exists in this list
* - 2 if the given name cannot fit in the 'name' array
* (don't forget about the null terminator) | null |
63c647dc5f004bf4898cf752 | 2023-02-08T15:24:37.665Z | Question from Code | v1 | this line of code is giving me a segmentation fault
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | while ((*user_ptr_add)->next != NULL){} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-08T15:41:05.495Z | Help Fix Code | v1 | null | void list_users(const User *curr) {
User *temp;
temp = (User *) curr;
while (temp != NULL){
printf("%s\n", temp->name);
temp = temp->next;
}
}
| Print the usernames of all users in the list starting at curr.
* Names should be printed to standard output, one per line. | null |
63c647dc5f004bf4898cf752 | 2023-02-08T15:52:43.230Z | Question from Code | v1 | Why is this function is only printing the last two nodes instead of all nodes? | void list_users(const User *curr) {
printf("User List\n");
User *temp;
User *head = (User *) curr;
temp = (User *) curr;
while (temp != NULL){
printf("\t%s\n", temp->name);
temp = temp->next;
}
curr = head;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-08T16:25:31.987Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if (strcmp(name1, name2) == 0){
return 3;
}
if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
return 4;
}
User *user1 = find_user(name1, head);
User **temp1 = user1->friends;
User *user2 = find_user(name2, head);
User **temp2 = user2->friends;
while (temp1 != NULL){
if (strcmp((**temp1)->name, (*user2)->name) == 0){
return 1;
}
temp1 = temp1->next;
}
if (**temp1 > 10 || **temp2 > 10){
return 2;
}
// There are no errors and can proceed
while (temp1->next != NULL){
temp1 = temp1->next;
}
strcpy(temp1->next, user2->name);
User *temp2 = user2->friends;
while (temp2->next != NULL){
temp2 = temp2->next;
}
strcpy(temp2->next, user1->name);
return 0;
}
| Make two users friends with each other. This is symmetric - a pointer to
* each user must be stored in the 'friends' array of the other.
*
* New friends must be added in the first empty spot in the 'friends' array.
*
* Return:
* - 0 on success.
* - 1 if the two users are already friends.
* - 2 if the users are not already friends, but at least one already has
* MAX_FRIENDS friends.
* - 3 if the same user is passed in twice.
* - 4 if at least one user does not exist.
*
* Do not modify either user if the result is a failure.
* NOTE: If multiple errors apply, return the *largest* error code that applies. | null |
63c647dc5f004bf4898cf752 | 2023-02-08T16:41:51.213Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
114 if (strcmp(name1, name2) == 0){
115 return 3;
116 }
117
118 if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
119 return 4;
120 }
121
122 User *user1 = find_user(name1, head);
123 User **friends1 = user1->friends;
124 User *user2 = find_user(name2, head);
125 User **friends2 = user2->friends;
126 int count1 = 0;
127 int count2 = 0;
128
129 while ((*friends1)->next != NULL){
130 if (strcmp((*friends1)->name,(*user2)->name) == 0){
131 return 1;
132 }
133 *friends1 = (*friends1)->next;
134 count1++;
135 if (count1 > 10){
136 return 2;
137 }
138 }
139 while ((*friends2)->next != NULL){
140 *friends2 = (*friends2)->next;
141 count2++;
142 if (count2 > 10){
143 return 2;
144 }
145 }
146 strcpy((*friends1)->next, (*user2)->name);
147 strcpy((*friends2)->next, (*user1)->name);
148 return 0;
149 }
| Make two users friends with each other. This is symmetric - a pointer to
98 * each user must be stored in the 'friends' array of the other.
99 *
100 * New friends must be added in the first empty spot in the 'friends' array.
101 *
102 * Return:
103 * - 0 on success.
104 * - 1 if the two users are already friends.
105 * - 2 if the users are not already friends, but at least one already has
106 * MAX_FRIENDS friends.
107 * - 3 if the same user is passed in twice.
108 * - 4 if at least one user does not exist.
109 *
110 * Do not modify either user if the result is a failure.
111 * NOTE: If multiple errors apply, return the *largest* error code that applies.
| null |
63c647dc5f004bf4898cf752 | 2023-02-08T16:59:13.191Z | General Question | v1 | How to print the contents of a file? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-08T17:16:08.344Z | Help Fix Code | v1 | null | int print_user(const User *user) {
while (user->friends != NULL){
printf("\t%s\n", (user->friends)->name);
user->friends = user->friends->next;
}
}
| tranverse through user's friends and print the name of each one | null |
63c647dc5f004bf4898cf752 | 2023-02-08T18:09:33.770Z | Help Fix Code | v1 | null | int print_user(const User *user) {
if (user == NULL){
return 1;
}
printf("Name: %s", user->name);
printf("------------------------------------------");
printf("Friends:\n");
User *friends = (User *) user->friends;
while (friends != NULL){
printf("\t%s\n", friends->name);
friends = friends->next;
}
printf("------------------------------------------");
printf("Posts:");
FILE *profile_pic;
profile_pic = fopen(user->profile_pic, "r");
c = fgetc(profile_pic);
if( feof(profile_pic) ) {
break ;
}
printf("%c", c);
fclose(profile_pic);
return 0;
}
| Print a user profile.
* For an example of the required output format, see the example output
* linked from the handout.
* Return:
* - 0 on success.
* - 1 if the user is NULL. | null |
63c647dc5f004bf4898cf752 | 2023-02-08T18:10:03.357Z | General Question | v1 | how to print characters of a file one by one? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-08T18:24:17.160Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
Post new_post;
//*contents = new_post;
new_post.author = author;
time_t curtime;
time(&curtime);
*new_post.date = ctime(&curtime);
return -1;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-08T18:28:35.244Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
Post new_post;
new_post.contents = contents;
new_post.author = *author;
time_t curtime;
time(&curtime);
new_post.date = ctime(&curtime);
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-08T18:34:19.117Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
Post new_post;
*new_post.contents = *contents;
strcpy(new_post.author, (*author)->name);
time_t curtime;
time(&curtime);
new_post.date = ctime(&curtime);
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-09T03:27:06.099Z | Question from Code | v1 | why is it giving me an error warning: control reaches end of non-void function [-Wreturn-type]
38 | }
| void read_bitmap_metadata(FILE *image, int *pixel_array_offset, int *width, int *height) {
fseek(image, 10, SEEK_SET);
fread(pixel_array_offset, 4, 1, image);
fseek(image, 18, SEEK_SET);
fread(width, 4, 1, image);
fseek(image, 22, SEEK_SET);
fread(height, 4, 1, image);
return;
} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-09T03:34:22.340Z | Help Fix Code | v1 | null | struct pixel *pointers = malloc(sizeof(struct pixel) * m); | First, allocate space for m `struct pixel *` values, where m is the
* height of the image. Each pointer will eventually point to one row of
* pixel data. | null |
63c647dc5f004bf4898cf752 | 2023-02-09T03:36:25.415Z | Help Fix Code | v1 | null | struct pixel *pointers = malloc(sizeof(struct pixel) * m);
for (int i = 0; i < m; i++){
pointers[i] = pointer[0] + i * sizeof(struct pixel);
} | First, allocate space for m `struct pixel *` values, where m is the
* height of the image. Each pointer will eventually point to one row of
* pixel data.
* 2. For each pointer you just allocated, initialize it to point to
* heap-allocated space for an entire row of pixel data.
| null |
63c647dc5f004bf4898cf752 | 2023-02-10T01:47:00.304Z | Help Fix Code | v1 | null | struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
int m = height;
struct pixel *pointers = malloc(sizeof(struct pixel) * m);
for (int i = 0; i < m; i++){
pointers[i] = pointers[i*3];
for (int j = 0; j < width; j++){
fseek(image, pixel_array_offset, SEEK_SET);
fread(pointers[i][j], 3, 1, image);
pixel_array_offset = pixel_array_offset + 3;
}
}
return **pointers;
}
| Read in pixel array by following these instructions:
*
* 1. First, allocate space for m `struct pixel *` values, where m is the
* height of the image. Each pointer will eventually point to one row of
* pixel data.
* 2. For each pointer you just allocated, initialize it to point to
* heap-allocated space for an entire row of pixel data.
* 3. Use the given file and pixel_array_offset to initialize the actual
* struct pixel values. Assume that `sizeof(struct pixel) == 3`, which is
* consistent with the bitmap file format.
* NOTE: We've tested this assumption on the Teaching Lab machines, but
* if you're trying to work on your own computer, we strongly recommend
* checking this assumption!
* 4. Return the address of the first `struct pixel *` you initialized. | null |
63c647dc5f004bf4898cf752 | 2023-02-10T02:04:49.002Z | Question from Code | v1 | Why is there a memory leak? | struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
int m = height;
struct pixel **pointers = malloc(sizeof(struct pixel) * m);
for (int i = 0; i < m; i++){
pointers[i] = malloc(sizeof(struct pixel) * width);
for (int j = 0; j < width; j++){
fseek(image, pixel_array_offset, SEEK_SET);
fread(&pointers[i][j], 3, 1, image);
pixel_array_offset = pixel_array_offset + 3;
}
}
return pointers;
}
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: bitmap_printer input_bmp\n");
exit(1);
}
FILE *image = fopen(argv[1], "rb");
if (image == NULL) {
fprintf(stderr, "Cannot open file\n");
exit(1);
}
// Read in bitmap file metadata
int pixel_array_offset, width, height;
read_bitmap_metadata(image, &pixel_array_offset, &width, &height);
// Print out metadata.
printf("Pixel array offset: %d\n", pixel_array_offset);
printf("Width: %d\n", width);
printf("Height: %d\n", height);
// Read in the pixel data
struct pixel **pixels = read_pixel_array(image, pixel_array_offset, width, height);
// Print out some pixels from each of the image's corners.
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5; j++) {
print_pixel(pixels[i][j]);
print_pixel(pixels[i][width - 1 - j]);
print_pixel(pixels[height - 1 - i][j]);
print_pixel(pixels[height - 1 - i][width - 1 - j]);
}
}
// Clean up: you need to do this!
fclose(image);
free(pixels);
return 0;
}
~
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-10T02:39:28.832Z | Help Fix Code | v1 | null | struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
int m = height;
struct pixel **pointers = malloc(sizeof(struct pixel*) * m);
for (int i = 0; i < m; i++){
pointers[i] = malloc(sizeof(struct pixel*) * width);
for (int j = 0; j < width; j++){
fseek(image, pixel_array_offset, SEEK_SET);
fread(&pointers[i][j], sizeof(struct pixel), 1, image);
pixel_array_offset = pixel_array_offset + sizeof(struct pixel);
}
}
return pointers;
}
int main(int argc, char **argv) {
for (int i = 0; i < height; i++){
for (int j = 0; j < width; j++){
free(pointers[i]);
}
free(**pointers);
}
return 0;
}
| free the pointers in main | null |
63c647dc5f004bf4898cf752 | 2023-02-10T02:42:32.455Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
for (int i = 0; i < height; i++){
for (int j = 0; j < width; j++){
free(pixels[i]);
}
free(pixels);
}
return 0;
}
struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
int m = height;
struct pixel **pointers = malloc(sizeof(struct pixel*) * m);
for (int i = 0; i < m; i++){
pointers[i] = malloc(sizeof(struct pixel*) * width);
for (int j = 0; j < width; j++){
fseek(image, pixel_array_offset, SEEK_SET);
fread(&pointers[i][j], sizeof(struct pixel), 1, image);
pixel_array_offset = pixel_array_offset + sizeof(struct pixel);
}
}
return pointers;
}
| free the malloc memory in main with a for loop | null |
63c647dc5f004bf4898cf752 | 2023-02-10T19:03:09.627Z | General Question | v1 | suppose we have the following line at the top of our program
#define MAXNAME = 32;
and then the declaration
char name[MAXNAME];
in the program. What will this declaration line become after the program has passed
through the C pre-processor? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-10T19:08:22.460Z | General Question | v1 | At our company, an employee has a regular pay rate but then gets 5 dollars
extra per hour whenever they are working as a supervisor.
Consider the following definition of a MACRO to represent this:
#define SUPERVISOR(regular) regular + 5
What will be the output of the following program fragment?
#define SUPERVISOR(regular) regular + 5
int main() {
int regular_pay = 20;
int hours_worked = 10;
printf("pay is %d\n", (hours_worked * SUPERVISOR(regular_pay)));
// rest omitted
}
| null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-10T22:09:29.881Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if (strcmp(name1, name2) == 0){
return 3;
}
if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
return 4;
}
User *user1 = find_user(name1, head);
User **friends1 = (*user1).friends;
User *user2 = find_user(name2, head);
User **friends2 = (*user2).friends;
int count1 = 0;
int count2 = 0;
while ((*friends1)->next != NULL){
if (strcmp((*friends1)->name, user2->name) == 0){
return 1;
}
*friends1 = (*friends1)->next;
count1++;
if (count1 > 10){
return 2;
}
}
while ((*friends2)->next != NULL){
*friends2 = (*friends2)->next;
count2++;
if (count2 > 10){
return 2;
}
}
(*friends1)->next = user2;
(*friends2)->next = user1;
return 0;
}
| Make two users friends with each other. This is symmetric - a pointer to
* each user must be stored in the 'friends' array of the other.
*
* New friends must be added in the first empty spot in the 'friends' array.
*
* Return:
* - 0 on success.
* - 1 if the two users are already friends.
* - 2 if the users are not already friends, but at least one already has
* MAX_FRIENDS friends.
* - 3 if the same user is passed in twice.
* - 4 if at least one user does not exist.
*
* Do not modify either user if the result is a failure.
* NOTE: If multiple errors apply, return the *largest* error code that applies. | null |
63c647dc5f004bf4898cf752 | 2023-02-10T22:16:49.160Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if (strcmp(name1, name2) == 0){
return 3;
}
if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
return 4;
}
User *user1 = find_user(name1, head);
User *friends1 = (*user1).friends;
User *user2 = find_user(name2, head);
User *friends2 = (*user2).friends;
int count1 = 0;
int count2 = 0;
while ((*friends1)->next != NULL){
if (strcmp((*friends1)->name, user2.name) == 0){
return 1;
}
*friends1 = (*friends1)->next;
count1++;
if (count1 > 10){
return 2;
}
}
while ((*friends2)->next != NULL){
*friends2 = (*friends2)->next;
count2++;
if (count2 > 10){
return 2;
}
}
(*friends1)->next = user2;
(*friends2)->next = user1;
return 0;
}
| Make two users friends with each other. This is symmetric - a pointer to
* each user must be stored in the 'friends' array of the other.
*
* New friends must be added in the first empty spot in the 'friends' array.
*
* Return:
* - 0 on success.
* - 1 if the two users are already friends.
* - 2 if the users are not already friends, but at least one already has
* MAX_FRIENDS friends.
* - 3 if the same user is passed in twice.
* - 4 if at least one user does not exist.
*
* Do not modify either user if the result is a failure.
* NOTE: If multiple errors apply, return the *largest* error code that applies. | null |
63c647dc5f004bf4898cf752 | 2023-02-13T15:30:16.611Z | Help Fix Code | v1 | null | void list_users(const User *curr) {
printf("User List\n");
User *temp;
temp = (User *) curr;
while (temp != NULL){
printf("\t%s\n", temp->name);
temp = temp->next;
}
} | Print the usernames of all users in the list starting at curr.
* Names should be printed to standard output, one per line. | null |
63c647dc5f004bf4898cf752 | 2023-02-13T15:43:41.575Z | Question from Code | v1 | Why is this initialization for friends1[] and friends2[] invalid? | char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
User *user1 = find_user(name1, head);
User friends1[] = (*user1).friends;
User *user2 = find_user(name2, head);
User friends2[] = (*user2).friends; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T16:01:14.600Z | Question from Code | v1 | why am I getting this error: error: ‘friends1’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
126 | friends1[i] = (*user1).friends[i]; | User *user1 = find_user(name1, head);
User **friends1;
int i = 0;
while ((*user1).friends[i] != NULL){
friends1[i] = (*user1).friends[i];
}
User *user2 = find_user(name2, head);
User **friends2;
int j = 0;
while ((*user2).friends[j] != NULL){
friends2[j] = (*user2).friends[j];
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T16:09:40.239Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if (strcmp(name1, name2) == 0){
return 3;
}
if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
return 4;
}
User *user1 = find_user(name1, head);
User **friends1;
friends1 = malloc(sizeof(User*)*MAX_FRIENDS);
int i = 0;
while ((*user1).friends[i] != NULL){
friends1[i] = (*user1).friends[i];
}
User *user2 = find_user(name2, head);
User **friends2;
friends2 = malloc(sizeof(User*)*MAX_FRIENDS);
int j = 0;
while ((*user2).friends[j] != NULL){
friends2[j] = (*user2).friends[j];
}
int count1 = 0;
int count2 = 0;
int x = 0;
int y = 0;
while (*friends1[x] != NULL){
if (strcmp((*friends1[x])->name, (*user2).name) == 0){
return 1;
}
x++;
count1++;
if (count1 > 10){
return 2;
}
}
while (*friends2[y] != NULL){
y++;
count2++;
if (count2 > 10){
return 2;
}
}
*friends1[x] = user2;
*friends2[y] = user1;
return 0;
} | Make two users friends with each other. This is symmetric - a pointer to
* each user must be stored in the 'friends' array of the other.
*
* New friends must be added in the first empty spot in the 'friends' array.
*
* Return:
* - 0 on success.
* - 1 if the two users are already friends.
* - 2 if the users are not already friends, but at least one already has
* MAX_FRIENDS friends.
* - 3 if the same user is passed in twice.
* - 4 if at least one user does not exist.
*
* Do not modify either user if the result is a failure.
* NOTE: If multiple errors apply, return the *largest* error code that applies. | null |
63c647dc5f004bf4898cf752 | 2023-02-13T18:05:49.218Z | Help Fix Code | v1 | null | User *user1 = find_user(name1, head);
User friends1[] = malloc(sizeof(User*)*MAX_FRIENDS);
int i = 0;
while ((*user1).friends[i] != NULL){
friends1[i] = (*user1).friends[i];
}
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | friends1 should be an array that stores all user1's friends | null |
63c647dc5f004bf4898cf752 | 2023-02-13T20:38:36.657Z | Question from Code | v1 | why is the initializer to friends1[] invalid? | User friends1[] = malloc(sizeof(User)*MAX_FRIENDS);
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T20:47:06.822Z | Help Fix Code | v1 | null | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
int make_friends(const char *name1, const char *name2, User *head) {
if (strcmp(name1, name2) == 0){
return 3;
}
if (find_user(name1, head) == NULL || find_user(name2, head) == NULL){
return 4;
}
User *user1 = find_user(name1, head);
User friends1[MAX_FRIENDS];
int i = 0;
while ((*user1).friends[i] != NULL){
friends1[i] = *(*user1).friends[i];
}
User *user2 = find_user(name2, head);
User friends2[MAX_FRIENDS];
int j = 0;
while ((*user2).friends[j] != NULL){
friends2[j] = *(*user2).friends[j];
}
int count1 = 0;
int count2 = 0;
int x = 0;
int y = 0;
while (friends1[x] != NULL){
if (friends1[x] == *user2){
return 1;
}
x++;
count1++;
if (count1 > 10){
return 2;
}
}
while (friends2[y] != NULL){
y++;
count2++;
if (count2 > 10){
return 2;
}
}
friends1[x] = *user2;
friends2[y] = *user1;
return 0;
}
| Make two users friends with each other. This is symmetric - a pointer to
* each user must be stored in the 'friends' array of the other.
*
* New friends must be added in the first empty spot in the 'friends' array.
*
* Return:
* - 0 on success.
* - 1 if the two users are already friends.
* - 2 if the users are not already friends, but at least one already has
* MAX_FRIENDS friends.
* - 3 if the same user is passed in twice.
* - 4 if at least one user does not exist.
*
* Do not modify either user if the result is a failure.
* NOTE: If multiple errors apply, return the *largest* error code that applies. | null |
63c647dc5f004bf4898cf752 | 2023-02-13T20:52:36.944Z | General Question | v1 | how to check if an element in the array is equal to NULL? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T20:58:33.229Z | Question from Code | v1 | why is friends1[x] != NULL giving me an error | User *user1 = find_user(name1, head);
User friends1[MAX_FRIENDS];
int i = 0;
while ((*user1).friends[i] != NULL){
friends1[i] = *(*user1).friends[i];
}
User *user2 = find_user(name2, head);
User friends2[MAX_FRIENDS];
int j = 0;
while ((*user2).friends[j] != NULL){
friends2[j] = *(*user2).friends[j];
}
int count1 = 0;
int count2 = 0;
int x = 0;
int y = 0;
while (friends1[x] != NULL){
if (friends1[x] == *user2){
return 1;
}
x++;
count1++;
if (count1 > 10){
return 2;
}
}
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T23:27:58.523Z | Question from Code | v1 | I want user_ptr_add to be unchanged after the function returns, why is it not working? | int create_user(const char *name, User **user_ptr_add){
User *temp = *user_ptr_add;
if (strlen(name) >= MAX_NAME){
return 2;
} else {
if (*user_ptr_add == NULL){
temp = *user_ptr_add;
*user_ptr_add = malloc(sizeof(User));
strcpy((*user_ptr_add)->name, name);
(*user_ptr_add)->next = NULL;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name) == 0){
(*user_ptr_add) = temp;
return 1;
}
*user_ptr_add = (*user_ptr_add)->next;
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
}
(*user_ptr_add) = temp;
return 0;
}
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-13T23:28:51.874Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add){
User *temp = *user_ptr_add;
if (strlen(name) >= MAX_NAME){
return 2;
} else {
if (*user_ptr_add == NULL){
temp = *user_ptr_add;
*user_ptr_add = malloc(sizeof(User));
strcpy((*user_ptr_add)->name, name);
(*user_ptr_add)->next = NULL;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name) == 0){
(*user_ptr_add) = temp;
return 1;
}
*user_ptr_add = (*user_ptr_add)->next;
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
}
(*user_ptr_add) = temp;
return 0;
}
}
| keep **user_ptr_add unchanged after the function returns | null |
63c647dc5f004bf4898cf752 | 2023-02-13T23:43:08.178Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add){
if (strlen(name) >= MAX_NAME){
return 2;
} else {
User *temp = *user_ptr_add;
if (*user_ptr_add == NULL){
*user_ptr_add = malloc(sizeof(User));
temp = *user_ptr_add;
strcpy((*user_ptr_add)->name, name);
(*user_ptr_add)->next = NULL;
} else {
while ((*user_ptr_add)->next != NULL){
if (strcmp((*user_ptr_add)->name, name) == 0){
(*user_ptr_add) = temp;
return 1;
}
*user_ptr_add = (*user_ptr_add)->next;
}
(*user_ptr_add)->next = malloc(sizeof(User));
strcpy((*user_ptr_add)->next->name, name);
(*user_ptr_add)->next->next = NULL;
}
(*user_ptr_add) = temp;
return 0;
}
}
| Ensure that user_ptr_add is not mutated when the function returns | null |
63c647dc5f004bf4898cf752 | 2023-02-14T02:00:24.973Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post new_post;
new_post.contents = contents;
strcpy(new_post.author, author->name);
time_t curtime;
time(&curtime);
*new_post.date = curtime;
new_post.next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post. | null |
63c647dc5f004bf4898cf752 | 2023-02-14T02:22:01.621Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
218 if (author == NULL || target == NULL){
219 return 2;
220 }
221 for (int i = 0; i < MAX_FRIENDS; i++){
222 if (author->friends[i] == target){
223 Post new_post;
224 strcpy(new_post.contents, contents);
225 strcpy(new_post.author, author->name);
226
227 time_t curtime;
228 time(&curtime);
229 *new_post.date = curtime;
230
231 new_post.next = target->first_post;
232 target->first_post = &new_post;
233 return 0;
234 }
235 }
236 return 1;
237 } | Make a new post from 'author' to the 'target' user,
205 * containing the given contents, IF the users are friends.
206 *
207 * Insert the new post at the *front* of the user's list of posts.
208 *
209 * 'contents' is a pointer to heap-allocated memory - you do not need
210 * to allocate more memory to store the contents of the post.
211 *
212 * Return:
213 * - 0 on success
214 * - 1 if users exist but are not friends
215 * - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-14T02:27:39.893Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
218 if (author == NULL || target == NULL){
219 return 2;
220 }
221 for (int i = 0; i < MAX_FRIENDS; i++){
222 if (author->friends[i] == target){
223 Post new_post = malloc(sizeof(Post));
224 strcpy(new_post.contents, contents);
225 strcpy(new_post.author, author->name);
226
227 time_t curtime;
228 time(&curtime);
229 *new_post.date = curtime;
230
231 new_post.next = target->first_post;
232 target->first_post = &new_post;
233 return 0;
234 }
235 }
236 return 1;
237 }
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-14T04:01:37.249Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
218 if (author == NULL || target == NULL){
219 return 2;
220 }
221 for (int i = 0; i < MAX_FRIENDS; i++){
222 if (author->friends[i] == target){
223 Post *new_post = malloc(sizeof(Post));
224 strcpy((*new_post->contents), contents);
225 strcpy((*new_post->author), author->name);
226
227 time_t curtime;
228 time(&curtime);
229 (*new_post)->date = curtime;
230
231 new_post->next = target->first_post;
232 target->first_post = &new_post;
233 return 0;
234 }
235 }
236 return 1;
237 }
238
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
205 * containing the given contents, IF the users are friends.
206 *
207 * Insert the new post at the *front* of the user's list of posts.
208 *
209 * 'contents' is a pointer to heap-allocated memory - you do not need
210 * to allocate more memory to store the contents of the post.
211 *
212 * Return:
213 * - 0 on success
214 * - 1 if users exist but are not friends
215 * - 2 if either User pointer is NULL | null |
63c647dc5f004bf4898cf752 | 2023-02-14T04:03:28.388Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post *new_post = malloc(sizeof(Post));
strcpy((new_post->contents), contents);
strcpy((new_post->author), author->name);
time_t curtime;
time(&curtime);
(new_post)->date = curtime;
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
| Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL
| null |
63c647dc5f004bf4898cf752 | 2023-02-14T04:19:29.129Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post *new_post = malloc(sizeof(Post));
strcpy(new_post->contents, contents);
strcpy(new_post->author, author->name);
time_t curtime;
time(&curtime);
new_post->date = &curtime;
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
| Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL
Incorrect assignment of new_post->next and target->first_post | null |
63c647dc5f004bf4898cf752 | 2023-02-14T04:22:36.565Z | Help Fix Code | v1 | null | int print_user(const User *user) {
if (user == NULL){
return 1;
}
FILE *profile_pic;
if ((profile_pic = fopen(user->profile_pic, "r")) != NULL){
int c;
while ((c = getc(profile_pic)) != EOF){
printf("%c", c);
}
fclose(profile_pic);
}
printf("\n");
printf("Name: %s\n", user->name);
printf("------------------------------------------\n");
printf("Friends:\n");
int i = 0;
while(user->friends[i] != NULL){
printf("%s\n", user->friends[i]->name);
i++;
}
printf("------------------------------------------\n");
printf("Posts:\n");
Post *temp = user->first_post;
while(user->first_post != NULL){
printf("From: %s\n", user->first_post->author);
printf("Date: %s\n", user->first_post->date);
printf("\n");
printf("%s\n", user->first_post->contents);
user->first_post = user->first_post->next;
}
user->first_post = temp;
printf("------------------------------------------\n");
return 0;
}
| Error in assigning first_post | null |
63c647dc5f004bf4898cf752 | 2023-02-14T16:45:44.397Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
250 User *temp = *user_ptr_del;
251 if (strcmp((*user_ptr_del)->name, name) == 0){
252 for (int i = 0; i < MAX_FRIENDS; i++){
253 for (int j = 0; j < MAX_FRIENDS; j++){
254 if (strcmp(((*user_ptr_del)->next->friends[i]->f riends[j]->name), name)== 0){
255 (*user_ptr_del)->next->friends[i]->frien ds[j] = (*user_ptr_del)->next->friends[i]->friends[j+1];
256 }
257 }
258 *user_ptr_del = temp;
259 return 0;
260 }
261 *user_ptr_del = (*user_ptr_del)->next;
262 } else {
263 while ((*user_ptr_del)->next != NULL){
264 if (strcmp((*user_ptr_del)->next->name, name) == 0){
265 for (int i = 0; i < MAX_FRIENDS; i++){
266 User *friend = (*user_ptr_del)->next->friends[i];
267 for (int j = 0; j < MAX_FRIENDS; j++){
268 if (strcmp((friend->friends[j]->name), name)== 0 ){
269 friend->friends[j] = friend->friends[j+1 ];
270 }
271 }
272 }
273 (*user_ptr_del)->next = (*user_ptr_del)->next->next;
274 (*user_ptr_del) = temp;
275 return 0;
276 }
277 *user_ptr_del = (*user_ptr_del)->next;
278 }
279 }
| * From the list pointed to by *user_ptr_del, delete the user
242 * with the given name.
243 * Remove the deleted user from any lists of friends.
244 *
245 * Return:
246 * - 0 on success.
247 * - 1 if a user with this name does not exist. | null |
63c647dc5f004bf4898cf752 | 2023-02-14T16:46:36.448Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
250 User *temp = *user_ptr_del;
251 if (strcmp((*user_ptr_del)->name, name) == 0){
252 for (int i = 0; i < MAX_FRIENDS; i++){
253 for (int j = 0; j < MAX_FRIENDS; j++){
254 if (strcmp(((*user_ptr_del)->next->friends[i]->f riends[j]->name), name)== 0){
255 (*user_ptr_del)->next->friends[i]->frien ds[j] = (*user_ptr_del)->next->friends[i]->friends[j+1];
256 }
257 }
258 *user_ptr_del = temp;
259 return 0;
260 }
261 *user_ptr_del = (*user_ptr_del)->next;
262 } else {
263 while ((*user_ptr_del)->next != NULL){
264 if (strcmp((*user_ptr_del)->next->name, name) == 0){
265 for (int i = 0; i < MAX_FRIENDS; i++){
266 User *friend = (*user_ptr_del)->next->friends[i];
267 for (int j = 0; j < MAX_FRIENDS; j++){
268 if (strcmp((friend->friends[j]->name), name)== 0 ){
269 friend->friends[j] = friend->friends[j+1 ];
270 }
271 }
272 }
273 (*user_ptr_del)->next = (*user_ptr_del)->next->next;
274 (*user_ptr_del) = temp;
275 return 0;
276 }
277 *user_ptr_del = (*user_ptr_del)->next;
278 }
279 }
| * From the list pointed to by *user_ptr_del, delete the user
242 * with the given name.
243 * Remove the deleted user from any lists of friends.
244 *
245 * Return:
246 * - 0 on success.
247 * - 1 if a user with this name does not exist. | null |
63c647dc5f004bf4898cf752 | 2023-02-14T18:24:20.475Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
User *temp = *user_ptr_del;
if (strcmp((*user_ptr_del)->name, name) == 0){
for (int i = 0; i < MAX_FRIENDS; i++){
while ((*user_ptr_del)->friends[i] != NULL){
for (int j = 0; j < MAX_FRIENDS; j++){
while ((*user_ptr_del)->friends[i]->friends[j] != NULL){
if (strcmp(((*user_ptr_del)->friends[i]->friends[j]->name), name)== 0){
(*user_ptr_del)->friends[i]->friends[j] = (*user_ptr_del)->friends[i]->friends[j+1];
}
}
}
}
(*user_ptr_del) = (*user_ptr_del)->next;
*user_ptr_del = temp;
return 0;
}
*user_ptr_del = (*user_ptr_del)->next;
} else {
while ((*user_ptr_del)->next != NULL){
if (strcmp((*user_ptr_del)->next->name, name) == 0){
for (int i = 0; i < MAX_FRIENDS; i++){
while ((*user_ptr_del)->next->friends[i] != NULL){
for (int j = 0; j < MAX_FRIENDS; j++){
while ((*user_ptr_del)->next->friends[i]->friends[j] != NULL){
if (strcmp((*user_ptr_del)->next->friends[j]->name, name)== 0){
(*user_ptr_del)->next->friends[j] = (*user_ptr_del)->next->friends[j+1];
}
}}
}}
(*user_ptr_del)->next = (*user_ptr_del)->next->next;
(*user_ptr_del) = temp;
return 0;
}
*user_ptr_del = (*user_ptr_del)->next;
}
}
return 0;
}
| From the list pointed to by *user_ptr_del, delete the user
* with the given name.
* Remove the deleted user from any lists of friends.
*
* Return:
* - 0 on success.
* - 1 if a user with this name does not exist. | null |
63c647dc5f004bf4898cf752 | 2023-02-14T18:47:05.323Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
if (strcmp((*user_ptr_del)->name, name) == 0){
for (int i = 0; i < MAX_FRIENDS; i++){
while ((*user_ptr_del)->friends[i] != NULL){
for (int j = 0; j < MAX_FRIENDS; j++){
while ((*user_ptr_del)->friends[i]->friends[j] != NULL){
if (strcmp(((*user_ptr_del)->friends[i]->friends[j]->name), name)== 0){
(*user_ptr_del)->friends[i]->friends[j] = (*user_ptr_del)->friends[i]->friends[j+1];
break;
}
}
}
}
(*user_ptr_del) = (*user_ptr_del)->next;
return 0;
}
*user_ptr_del = (*user_ptr_del)->next;
} else {
while ((*user_ptr_del)->next != NULL){
if (strcmp((*user_ptr_del)->next->name, name) == 0){
for (int i = 0; i < MAX_FRIENDS; i++){
while ((*user_ptr_del)->next->friends[i] != NULL){
for (int j = 0; j < MAX_FRIENDS; j++){
while ((*user_ptr_del)->next->friends[i]->friends[j] != NULL){
if (strcmp((*user_ptr_del)->next->friends[j]->name, name)== 0){
(*user_ptr_del)->next->friends[j] = (*user_ptr_del)->next->friends[j+1];
}
}}
}}
(*user_ptr_del)->next = (*user_ptr_del)->next->next;
return 0;
}
*user_ptr_del = (*user_ptr_del)->next;
}
}
return 1;
}
| From the list pointed to by *user_ptr_del, delete the user
* with the given name.
* Remove the deleted user from any lists of friends.
*
* Return:
* - 0 on success.
* - 1 if a user with this name does not exist.
There is an error between lines 3 and 13 | null |
63c647dc5f004bf4898cf752 | 2023-02-14T20:46:57.762Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
if (strcmp((*user_ptr_del)->name, name) == 0){
int i = 0;
while (((*user_ptr_del)->friends[i] != NULL) && (i < MAX_FRIENDS)){
int j = 0;
while (((*user_ptr_del)->friends[i]->friends[j] != NULL) && (j < MAX_FRIENDS)){
if (strcmp(((*user_ptr_del)->friends[i]->friends[j]->name), name)== 0){
(*user_ptr_del)->friends[i]->friends[j] = (*user_ptr_del)->friends[i]->friends[j+1];
}
j++;
}
i++;
}
(*user_ptr_del) = (*user_ptr_del)->next;
return 0;
}
| delete the first user From the list pointed to by *user_ptr_del | null |
63c647dc5f004bf4898cf752 | 2023-02-15T01:28:01.408Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post *new_post = malloc(sizeof(Post));
strcpy(new_post->contents, contents);
strcpy(new_post->author, author->name);
time_t curtime;
time(&curtime);
new_post->date = &curtime;
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
Why is strcpy(new_post->contents, contents); giving me a segmentation fault? | null |
63c647dc5f004bf4898cf752 | 2023-02-15T01:31:32.774Z | Question from Code | v1 | why is *(user->first_post) = *(user->first_post)->next; giving me a segmentation fault? | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post *new_post = malloc(sizeof(Post));
strcpy(new_post->contents, contents);
strcpy(new_post->author, author->name);
time_t curtime;
time(&curtime);
new_post->date = &curtime;
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-15T01:32:46.181Z | Help Fix Code | v1 | null | int make_post(const User *author, User *target, char *contents) {
if (author == NULL || target == NULL){
return 2;
}
for (int i = 0; i < MAX_FRIENDS; i++){
if (author->friends[i] == target){
Post *new_post = malloc(sizeof(Post));
strcpy(new_post->contents, contents);
strcpy(new_post->author, author->name);
time_t curtime;
time(&curtime);
new_post->date = &curtime;
new_post->next = target->first_post;
target->first_post = new_post;
return 0;
}
}
return 1;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Make a new post from 'author' to the 'target' user,
* containing the given contents, IF the users are friends.
*
* Insert the new post at the *front* of the user's list of posts.
*
* 'contents' is a pointer to heap-allocated memory - you do not need
* to allocate more memory to store the contents of the post.
*
* Return:
* - 0 on success
* - 1 if users exist but are not friends
* - 2 if either User pointer is NULL
Why is *(user->first_post) = *(user->first_post)->next; giving me a segmentation fault? | null |
63c647dc5f004bf4898cf752 | 2023-02-15T01:34:08.038Z | Help Fix Code | v1 | null | int print_user(const User *user) {
if (user == NULL){
return 1;
}
FILE *profile_pic;
if ((profile_pic = fopen(user->profile_pic, "r")) != NULL){
int c;
while ((c = getc(profile_pic)) != EOF){
printf("%c", c);
}
fclose(profile_pic);
}
printf("\n");
printf("Name: %s\n", user->name);
printf("------------------------------------------\n");
printf("Friends:\n");
int i = 0;
while(user->friends[i] != NULL){
printf("%s\n", user->friends[i]->name);
i++;
}
printf("------------------------------------------\n");
printf("Posts:\n");
while(user->first_post != NULL){
printf("From: %s\n", user->first_post->author);
printf("Date: %s\n", ctime(user->first_post->date));
printf("\n");
printf("%s\n", user->first_post->contents);
user->first_post = user->first_post->next;
}
printf("------------------------------------------\n");
return 0;
}
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post; | Print a user profile.
* For an example of the required output format, see the example output
* linked from the handout.
* Return:
* - 0 on success.
* - 1 if the user is NULL.
Why is *(user->first_post) = *(user->first_post)->next; giving me an segmentation fault? | null |
63c647dc5f004bf4898cf752 | 2023-02-17T01:57:09.128Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
dest[i] = src[i];
}
dest[capacity] = '\0';
return dest;
} | Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset. | null |
63c647dc5f004bf4898cf752 | 2023-02-17T01:58:07.555Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
dest[i] = src[i];
}
dest[capacity] = "\0";
return dest;
} | Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset. | null |
63c647dc5f004bf4898cf752 | 2023-02-17T02:15:29.774Z | Explain Code | v1 | null | #include <stdio.h>
#define SIZE 4
#define OVERFLOW 4
int main() {
int index = 0;
int i;
int before[SIZE] = {10, 10, 10, 10};
int a[SIZE] = {0, 0, 0, 0};
int after[SIZE] = {10, 10, 10, 10};
printf("Address of the variables:\n");
for (index = 0; index < SIZE; index++) {
printf("%lx -> &after[%d]\n", (unsigned long) &after[index], index);
}
for (index = 0; index < SIZE; index++) {
printf("%lx -> &a[%d]\n", (unsigned long) &a[index], index);
}
for (index = 0; index < SIZE; index++) {
printf("%lx -> &before[%d]\n", (unsigned long) &before[index], index);
}
printf("%lx -> &i\n", (unsigned long)&i);
printf("%lx -> &index\n", (unsigned long)&index);
printf("\n");
printf("Initial values:\n");
printf("i = %d\n", i);
printf("before = {%d, %d, %d, %d}\n", before[0], before[1], before[2], before[3]);
printf("a = {%d, %d, %d, %d}\n", a[0], a[1], a[2], a[3]);
printf("after = {%d, %d, %d, %d}\n", after[0], after[1], after[2], after[3]);
printf("\n");
for (i = 0; i < OVERFLOW; i++) {
a[i] = i * 10;
printf("i = %d\n", i);
printf("before = {%d, %d, %d, %d}\n", before[0], before[1], before[2], before[3]);
printf("a = {%d, %d, %d, %d}\n", a[0], a[1], a[2], a[3]);
printf("after = {%d, %d, %d, %d}\n", after[0], after[1], after[2], after[3]);
}
return 0;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:46:23.712Z | General Question | v1 | How to add a null terminator to the last value of a string without using strcpy or strncpy? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:48:07.225Z | General Question | v1 | How to add a null terminator to the last value of a string without using any string functions?? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:48:59.757Z | Question from Code | v1 | Why is this string not properly terminated with a null character? | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
dest[i] = src[i];
}
dest[capacity] = '\0';
return dest;
} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:50:16.534Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
dest[i] = src[i];
}
dest[capacity - 1] = '\0';
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset. | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:52:10.220Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
if (src[i] == '\0'){
break;
} else {
dest[i] = src[i];
}
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset. | null |
63c647dc5f004bf4898cf752 | 2023-02-17T13:52:35.457Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
for (int i = 0; i < capacity - 1; i++){
if (src[i] == '\0'){
break;
} else {
dest[i] = src[i];
}
dest[capacity - 1] = '\0';
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset. | null |
63c647dc5f004bf4898cf752 | 2023-02-25T18:57:17.406Z | Question from Code | v1 | Why can't I dereference s twice? | char *s = malloc(6 * sizeof(char));
strcpy(s, "hello");
// missing code
x = **s; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-25T18:57:59.876Z | Question from Code | v1 | This gives me an error. Why can't I dereference s twice? | char *s = malloc(6 * sizeof(char));
strcpy(s, "hello");
// missing code
x = **s; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-25T19:00:51.185Z | Question from Code | v1 | What is the missing code? | char *course = "csc207";
// missing code
x = course;
x[5] = ’9’; | null | null |
63c647dc5f004bf4898cf752 | 2023-02-25T19:29:26.475Z | Explain Code | v1 | null | struct event {
char *month;
int day;
};
/* Set the month and day of an event struct given a string in the format
* "MonthName DayNumber"
*
* For example, if arg is "December 25", the event’s month should be set to "December",
* and its day should be set to 25.
*/
void set_struct(struct event *e, char *arg) {
char *tmp = strchr(arg, ’ ’);
e->date = strtol(tmp + 1, NULL, 10);
int size = strlen(arg) - strlen(tmp) + 1;
e->month = malloc(sizeof(char) * size);
strncpy(e->month, arg, size - 1);
e->month[size] = ’\0’;
} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-25T20:01:32.969Z | Explain Code | v1 | null | char *intertwine(char *s1, char *s2) {
retval[size_ret] = ’\0’;
return retval;
char *result = malloc(strlen(s1) + strlen(s2) + 1);
int min = strlen(s1);
if (strlen(s2) < min) {
min = strlen(s2);
}
for (int i = 0; i < min; i++) {
result[i*2] = s1[i];
result[i*2 + 1] = s2[i];
}
result[min*2] = ’\0’;
strcat(result, &s1[min]);
strcat(result, &s2[min]);
return result;
} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-25T20:12:05.941Z | Question from Code | v1 | Why do we need the address of s1 in strcat(result, &s1[min]); ? | char *intertwine(char *s1, char *s2) {
retval[size_ret] = ’\0’;
return retval;
char *result = malloc(strlen(s1) + strlen(s2) + 1);
int min = strlen(s1);
if (strlen(s2) < min) {
min = strlen(s2);
}
for (int i = 0; i < min; i++) {
result[i*2] = s1[i];
result[i*2 + 1] = s2[i];
}
result[min*2] = ’\0’;
strcat(result, &s1[min]);
strcat(result, &s2[min]);
return result;
} | null | null |
63c647dc5f004bf4898cf752 | 2023-02-26T15:08:54.126Z | Explain Code | v1 | null | char **w = malloc(2 * sizeof(char *));
w[0] = "hello";
*(w + 1) = w[0] + 1;
printf("%s, %s", w[0], w[1]); | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T14:53:36.159Z | General Question | v1 | What is the difference between -> and . in c? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T15:23:50.290Z | General Question | v1 | What is a dangling pointer? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T18:31:24.145Z | General Question | v1 | When should I allocate dynamic memory? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T18:34:52.928Z | Help Fix Code | v1 | null | struct node {
int ID;
char *name; // Points to a dynamically allocated string.
struct node *next;
};
void format_name(struct node *head) {
Struct node *temp = head;
while (temp){
char *last;
char *first;
fscanf(temp->name, "%s", &last);
fsacnf(temp->name, "%s", &first);
char *name;
strcat(name, first);
strcat(name, "-");
strcat(name, last);
strcy(temp->name, name);
temp = temp->next;
}
return 0;
} | Considering that the name of each linked list node has the form "lastname, firstname", for each
node starting at the specified head, reorder the two names and convert them into the following form:
"firstname-lastname". Write your code so that it does not have a memory leak. | null |
63c647dc5f004bf4898cf752 | 2023-02-27T19:11:21.682Z | Question from Code | v1 | Why does this code give a run-time error for returning stack memory? | int *mkpoint(int x, int y) {
int pt[2] = {x, y};
return pt;
}
x = mkpoint(3, 4); | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T21:46:30.455Z | General Question | v1 | when does a segmentation fault happen? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T21:47:38.452Z | Question from Code | v1 | If I removed result[size] = '\0';, what error would occur and why? | char *every_nth(char *s, int n) {
3
4 int size = strlen(s) / n;
5
6 char *result = malloc(sizeof(char) * size + 1);
7
8 int i = 0;
9 for(i = 0; i < size; i++) {
10 result[i] = s[i * n];
11 }
12
13 result[size] = ’\0’;
14
15 return result;
16
17 } | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T21:48:05.219Z | General Question | v1 | when would extra output happen? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-27T21:49:16.362Z | General Question | v1 | Are char * and strings the same in all cases? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-28T00:58:54.588Z | General Question | v1 | What is the difference between gcc -c and GCC -o? | null | null | null |
63c647dc5f004bf4898cf752 | 2023-02-28T01:02:35.749Z | Question from Code | v1 | What is **w? | char **w = malloc(2 * sizeof(char *));
w[0] = "hello";
*(w + 1) = w[0] + 1;
printf("%s, %s", w[0], w[1]); | null | null |
63c647dc5f004bf4898cf752 | 2023-02-28T01:03:31.512Z | Question from Code | v1 | Why is "hello" spread across w[0] to w[4], instead of being pointed to by w[0]? | char **w = malloc(2 * sizeof(char *));
w[0] = "hello";
*(w + 1) = w[0] + 1;
printf("%s, %s", w[0], w[1]); | null | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:21:01.547Z | Explain Code | v1 | null | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main() {
int ret;
printf("A\n");
ret = fork();
printf("B\n");
if (ret < 0) {
perror("fork");
exit(1);
} else if (ret == 0) {
printf("C\n");
} else {
printf("D\n");
}
printf("E\n");
return 0;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:26:13.375Z | Question from Code | v1 | How many processes are created, including the original parent, when forkloop is called with 2, 3, and 4 as arguments? n arguments? | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:28:57.123Z | Question from Code | v1 | If we run forkloop 1, two processes are created, the original parent process and its child. Assuming the process id of the parent is 414 and the process id of the child is 416, we can represent the relationship between these processes using the following ASCII diagram:
414 -> 416
Use a similar ASCII diagram to show the processes created and their relationships when you run forkloop 3. In other words, how many processes does the parent create? How many do each of the child processes create? | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:37:01.256Z | Explain Code | v1 | null | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
| null | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:40:42.123Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
~ | Only the original parent calls fork and the new children do not create additional processes. | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:41:41.224Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
if (n = 0){
break;
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
~ | Only the original parent calls fork and the new children do not create additional processes. | null |
63c647dc5f004bf4898cf752 | 2023-03-02T02:45:04.096Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
if (n == 0){
break;
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | Only the original parent calls fork and the new children do not create additional processes. | null |
Subsets and Splits
No saved queries yet
Save your SQL queries to embed, download, and access them later. Queries will appear here once saved.