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stringlengths 1
1.24k
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|---|---|---|---|---|---|---|---|
63c648285f004bf4898cf9f0 | 2023-03-24T21:36:21.383Z | General Question | v2 | how do I point to a substring at position 5 of a string | null | null | null |
63c648285f004bf4898cf9f0 | 2023-04-06T03:18:03.994Z | General Question | v2 | how do I use asprintf in a loop | null | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:26:59.149Z | Explain Code | v1 | null | char phone[11];
scanf("%s", phone); | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:29:15.572Z | Explain Code | v1 | null | char phone[11];
scanf("%s", phone);
printf("%s", phone); | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:30:35.405Z | General Question | v1 | How does printf work with a pointer to a single character | null | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:47:28.391Z | General Question | v1 | what does scanf return? | null | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:47:56.327Z | General Question | v1 | What does scanf return when input stream is closed? | null | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:48:19.617Z | General Question | v1 | What type is EOF | null | null | null |
63c648295f004bf4898cf9fa | 2023-01-19T01:49:39.743Z | Explain Code | v1 | null | scanf("%d", &num) != EOF | null | null |
63c648295f004bf4898cf9fa | 2023-01-23T04:14:28.100Z | Help Fix Code | v1 | null | char[9] perms;
int file_size;
int acc = 0;
char[32] file_name;
scanf("%s %*d %*s %*s %d %*s %*s %*s %*s %s", perms, &file_size, file_name); | this code should compile, if it is in a function. | null |
63c648295f004bf4898cf9fa | 2023-01-25T02:43:13.450Z | Help Fix Code | v1 | null | int *build_array(char **strs, int size) {
int *int_array = malloc(sizeof(int) * size);
for(int i = 0; i < 4; i++){
int_array[i] = strtol(strs[i], NULL, 10);
}
return int_array;
}
| **strs is an array filled with number as strings. convert them all into ints, put them into an int array, and return the int array | null |
63c648295f004bf4898cf9fa | 2023-01-25T02:44:12.916Z | Help Fix Code | v1 | null | int *build_array(char **strs, int size) {
int *int_array = malloc(sizeof(int) * size);
for(int i = 0; i < size; i++){
int_array[i] = strtol(strs[i], NULL, 10);
}
return int_array;
}
| return a pointer to an array of ints, which is strs all converted to ints | null |
63c648295f004bf4898cf9fa | 2023-02-08T03:56:12.010Z | Help Fix Code | v1 | null | /*
* Read in the location of the pixel array, the image width, and the image
* height in the given bitmap file.
*/
void read_bitmap_metadata(FILE *image, int *pixel_array_offset, int *width, int *height) {
fseek(image, 10, SEEK_SET);
fread(pixel_array_offset, sizeof(int), 1, image);
fseek(image, 18, SEEK_SET);
fread(width, sizeof(int), 1, SEEK_SET);
fseek(image, 22, SEEK_SET);
fread(height, sizeof(int), 1, SEEK_SET);
} | set pixel_array_offset, width, and height to what was in the file | null |
63c648295f004bf4898cf9fa | 2023-02-08T03:56:57.807Z | Explain Code | v1 | null | void read_bitmap_metadata(FILE *image, int *pixel_array_offset, int *width, int *height) {
fseek(image, 10, SEEK_SET);
fread(pixel_array_offset, sizeof(int), 1, image);
fseek(image, 18, SEEK_SET);
fread(width, sizeof(int), 1, SEEK_SET);
fseek(image, 22, SEEK_SET);
fread(height, sizeof(int), 1, SEEK_SET);
} | null | null |
63c648295f004bf4898cf9fa | 2023-02-16T23:08:49.454Z | Explain Code | v1 | null | Action *anode = malloc(sizeof(Action));
// add values to anode; code omitted
// put the action node into the rule
Action **ap = &(cur_rule->actions); // pointer to pointer of actions
while(*ap != NULL){
*ap = (*ap)->next_act;
}
*ap = anode; | null | null |
63c648295f004bf4898cf9fa | 2023-03-03T02:33:40.787Z | General Question | v1 | Should I use strncpy or strncat if I don't know the size of the string I'm copying or concatenating to? | null | null | null |
63c648295f004bf4898cf9fa | 2023-03-05T00:31:00.666Z | General Question | v1 | How do I check if a file exists in current working directory? | null | null | null |
63c648295f004bf4898cf9fa | 2023-03-09T00:04:20.148Z | General Question | v1 | What is the read() command? | null | null | null |
63c6482c5f004bf4898cfa18 | 2023-01-30T04:37:09.299Z | General Question | v1 | How do I check permissions in a C file | null | null | null |
63c6482c5f004bf4898cfa18 | 2023-01-30T07:47:08.396Z | General Question | v1 | write me a for loop that loops from 0 to 9
| null | null | null |
63c6482c5f004bf4898cfa18 | 2023-01-30T08:07:47.925Z | General Question | v1 | if I want to include helper functions from another file into the main file, what do I do | null | null | null |
63c6482c5f004bf4898cfa18 | 2023-01-30T08:17:39.102Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
#include "sin_helpers.c"
int populate_array(int, int *);
int check_sin(int *);
int main(int argc, char **argv) {
// TODO: Verify that command line arguments are valid.
if (!(argc == 2)) {
return 2;
}
// TODO: Parse arguments and then call the two helpers in sin_helpers.c
// to verify the SIN given as a command line argument.
int socialInsuranceNum = strtol(argv[1], NULL, 10);
int numArray[9];
int ans;
populate_array(socialInsuranceNum, numArray);
ans = check_sin(numArray);
printf("%d", ans);
return ans;
}
| My code is supposed to print if the SIN is valid but it states there are multiple definitions for check_sin | null |
63c6482c5f004bf4898cfa18 | 2023-02-09T06:30:01.427Z | Help Fix Code | v1 | null |
struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
struct pixel **ptr = malloc(height*sizeof(struct pixel));
for (int i = 0; i < height; i++) {
ptr[i] = malloc(width * sizeof(struct pixel));
}
fseek(image, pixel_array_offset, SEEK_SET);
for (int i = 0; i < height; i++) {
fread(ptr[i], sizeof(struct pixel), width, image);
}
return ptr;
} | /*
* 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 |
63c6482c5f004bf4898cfa18 | 2023-02-14T23:48:49.690Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
User *current_user = *user_ptr_add;
while (current_user != NULL) {
if (strcmp(current_user->name, name) == 0) {
return 1;
}
current_user = current_user->next;
}
if (strlen(name) + 1 > MAX_NAME) {
return 2;
}
User *new_user = malloc(sizeof(User));
strcpy(new_user->name, name);
new_user->next = NULL;
if (*user_ptr_add == NULL) {
*user_ptr_add = new_user;
} else {
current_user = *user_ptr_add;
while (current_user->next != NULL) {
current_user = current_user->next;
}
current_user->next = new_user;
}
// Return 0 to indicate success
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 |
63c6482c5f004bf4898cfa18 | 2023-02-15T00:25:50.131Z | Help Fix Code | v1 | null |
int update_pic(User *user, const char *filename) {
if (strlen(filename) > MAX_NAME) {
return 2; // Filename too long
}
FILE *file = fopen(filename, "r");
if (file == NULL) {
return 1; // File does not exist or cannot be opened
}
fclose(file);
// Update the user's profile picture filename
strcpy(user->profile_pic, filename);
return 0; // Success
return -1;
} | /*
* Change the filename for the profile pic of the given user.
*
* Return:
* - 0 on success.
* - 1 if the file does not exist or cannot be opened.
* - 2 if the filename is too long.
*/ | null |
63c6482c5f004bf4898cfa18 | 2023-02-15T03:09:38.881Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if(find_user(name1, (const User *) head) == NULL || find_user(name2, (const User *) head) == NULL){
return 4;
}
if(strcmp(name1, name2) == 0){
return 3;
}
User *user1 = find_user(name1, (const User *) head);
User *user2 = find_user(name2, (const User *) head);
for(int i = 0; i < sizeof(user1->friends); i++){
if(strcmp(user1->friends[i]->name, name2) == 0){
return 1;
}
}
for(int i = 0; i < sizeof(user2->friends); i++){
if(strcmp(user2->friends[i]->name, name1) == 0){
return 1;
}
}
if (sizeof(user1->friends) >= MAX_FRIENDS || sizeof(user2->friends) >= MAX_FRIENDS){
return 2;
}
for(int i = 0; i < sizeof(user1->friends); i++){
if(user1->friends[i] == NULL){
user1->friends[i] = user2;
}
}
for(int i = 0; i < sizeof(user2->friends); i++){
if(user2->friends[i] == NULL){
user2->friends[i] = 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 |
63c6482c5f004bf4898cfa18 | 2023-02-15T03:18:56.305Z | Help Fix Code | v1 | null | int make_friends(const char *name1, const char *name2, User *head) {
if(find_user(name1, (const User *) head) == NULL || find_user(name2, (const User *) head) == NULL){
return 4;
}
if(strcmp(name1, name2) == 0){
return 3;
}
User *user1 = find_user(name1, (const User *) head);
User *user2 = find_user(name2, (const User *) head);
for(int i = 0; i < sizeof(user1->friends); i++){
if(strcmp(user1->friends[i]->name, name2) == 0){
return 1;
}
}
for(int i = 0; i < sizeof(user2->friends); i++){
if(strcmp(user2->friends[i]->name, name1) == 0){
return 1;
}
}
if (sizeof(user1->friends) >= MAX_FRIENDS || sizeof(user2->friends) >= MAX_FRIENDS){
return 2;
}
for(int i = 0; i < MAX_FRIENDS; i++){
if(user1->friends[i] == NULL){
user1->friends[i] = user2;
}
}
for(int i = 0; i < MAX_FRIENDS; i++){
if(user2->friends[i] == NULL){
user2->friends[i] = 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 |
63c6482c5f004bf4898cfa18 | 2023-02-15T03:48:34.262Z | Help Fix Code | v1 | null | for(int i = 0; i < MAX_FRIENDS; i++){
if(strcmp(user1->friends[i]->name, name2) == 0){
return 1;
}
} | This snippet is supposed to compare the names of the users and return 1 if they are the same | null |
63c6482c5f004bf4898cfa18 | 2023-02-15T06:55:07.102Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
int exists = 0;
User *current_user = *user_ptr_del;
while (current_user != NULL) {
if (strcmp(current_user->name, name) == 0) {
for (int i = 0; i < MAX_FRIENDS; i++) {
if(current_user->friends[i] != NULL){
//Look through targets list of friends' list of friends and delete target from them
for (int a = 0; a < MAX_FRIENDS; a++) {
if(current_user->friends[i]->friends[a] != NULL && strcmp(current_user->friends[i]->friends[a]->name, name) == 0){
current_user->friends[i]->friends[a] = NULL;
}
}
}
}
exists = 1;
}
current_user = current_user->next;
}
if (exists == 1){
// Free memory associated with user
free(current_user->name);
free(current_user->profile_pic);
for (int i = 0; i < MAX_FRIENDS; i++) {
free(current_user->friends[i]);
}
free(current_user->friends);
Post*currentPost = current_user->first_post;
while (currentPost != NULL){
free(currentPost->author);
free(currentPost->date);
free(currentPost->contents);
Post*nextPost = currentPost->next;
free(currentPost);
currentPost = nextPost;
}
free(current_user);
return 0;
}
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. | null |
63c6482c5f004bf4898cfa18 | 2023-02-15T07:17:16.972Z | Help Fix Code | v1 | null | for (int i = 0; i < MAX_FRIENDS; i++) {
free(current_user->friends[i]);
} | Code is supposed to free each element of the friends array but the error is double free detected in tcache 2
| null |
63c6482c5f004bf4898cfa18 | 2023-02-17T00:37:15.441Z | 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] != NULL){
memset(dest[i], src[i], 1);
}
else{
memset(dest[i], '\0', 1);
}
}
memset(dest[capacity-1], '\0', 1);
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 |
63c6482e5f004bf4898cfa2c | 2023-01-17T20:07:46.351Z | General Question | v1 | What are double pointers for | null | null | null |
63c6482e5f004bf4898cfa2c | 2023-01-17T20:35:16.508Z | General Question | v1 | why can I access an array index further than the size of the array | null | null | null |
63c6482e5f004bf4898cfa2c | 2023-01-18T18:59:37.582Z | General Question | v1 | how to know when the input stream ends with scans | null | null | null |
63c6482e5f004bf4898cfa2c | 2023-01-18T19:01:54.577Z | General Question | v1 | how do I check the end of input stream from the terminal with scanf | null | null | null |
63c6482f5f004bf4898cfa3b | 2023-02-28T01:43:42.658Z | Question from Code | v1 | what happens when I try to call strtol on "42" | #include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
int main(int argc, char **argv) {
char *next = NULL;
errno = 0;
long longi = strtol(argv[1], &next, 0);
int i = longi;
printf("longi: %ld\n",longi);
printf("i: %d\n",i);
printf("next is |%s|\n",next);
if(errno != 0) {
perror("strtol");
}
return 0;
} | null | null |
63c6482f5f004bf4898cfa3b | 2023-02-28T01:45:21.115Z | Question from Code | v1 | what happens when base is 0 for strtol | #include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
int main(int argc, char **argv) {
char *next = NULL;
errno = 0;
long longi = strtol(argv[1], &next, 0);
int i = longi;
printf("longi: %ld\n",longi);
printf("i: %d\n",i);
printf("next is |%s|\n",next);
if(errno != 0) {
perror("strtol");
}
return 0;
} | null | null |
63c6482f5f004bf4898cfa3b | 2023-02-28T01:46:38.931Z | Explain Code | v1 | null | #include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
int main(int argc, char **argv) {
char *next = NULL;
errno = 0;
long longi = strtol(argv[1], &next, 0);
int i = longi;
printf("longi: %ld\n",longi);
printf("i: %d\n",i);
printf("next is |%s|\n",next);
if(errno != 0) {
perror("strtol");
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T14:41:27.424Z | Explain Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int i;
scanf("%s %d", phone, &i);
printf("%s %d", phone, i);
if (i == -1) {
printf("%s\n", phone);
} else if (i > -1 && i < 10) {
printf("%c\n", phone[i]);
} else {
printf("ERROR\n");
return 1;
}
return 0;
}
| null | null |
63c648305f004bf4898cfa40 | 2023-01-20T14:48:02.898Z | General Question | v1 | what scanf return
| null | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T14:54:52.155Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t;
int i;
// repeatedly reads integers until standard input is closed
while (t < 10) {
scanf("%s", &phone[t]);
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T14:56:56.744Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t;
int i;
// repeatedly reads integers until standard input is closed
while (t < 10) {
scanf("%s", phone[t]);
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T15:00:58.620Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t;
int i;
// repeatedly reads integers until standard input is closed
while (t < 10) {
t += scanf("%s", &phone[t]);
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T15:04:16.699Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t = 0;
int i;
// repeatedly reads integers until standard input is closed
while (t < 10) {
t += scanf("%s", &phone[t]);
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T15:06:06.332Z | Explain Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t = 0;
int i;
// repeatedly reads integers until standard input is closed
while (t < 10) {
t += scanf("%s", &phone[t]);
}
return 0;
}
| null | null |
63c648305f004bf4898cfa40 | 2023-01-20T15:08:56.910Z | General Question | v1 | what return value of scanf indicates that the standard input is closed | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-20T15:21:12.265Z | Explain Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
char phone[11];
int t = 0;
int i;
scanf("%s", phone);
// repeatedly reads integers until standard input is closed
while (scanf("%d", &i) != EOF) {
if (i == -1) {
// prints the phone number
printf("%s\n", phone);
} else if (i > -1 && i < 10) {
// prints the character at that index in the phone number
printf("%c\n", phone[i]);
} else {
// prints an error message
printf("ERROR\n");
return 1;
}
}
return 0;
}
| null | null |
63c648305f004bf4898cfa40 | 2023-01-20T20:17:16.250Z | General Question | v1 | what %i represent in scanf() in c? | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-25T00:05:08.405Z | Explain Code | v1 | null |
/* Write your solution here */
void fib(int **fseq, int n) {
*fseq = malloc(sizeof(int) * n);
fseq[0] = 0;
for (int i = 1; i < n; i++) {
if (i == 1) {
fseq[1] = 1;}
else {
fseq[i] = fseq[i-2] + fseq[i-1];
}
}
}
int main(int argc, char **argv) {
/* do not change this main function */
int count = strtol(argv[1], NULL, 10);
int *fib_sequence;
fib(&fib_sequence, count);
for (int i = 0; i < count; i++) {
printf("%d ", fib_sequence[i]);
}
free(fib_sequence);
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-25T00:52:37.874Z | General Question | v1 | how do you use malloc()? | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-25T01:37:04.770Z | General Question | v1 | how do we convert a float into a integer? | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-25T01:38:33.282Z | Explain Code | v1 | null | float x = 1.5;
printf("%d", (int)x); | null | null |
63c648305f004bf4898cfa40 | 2023-01-25T01:58:24.718Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
/*
* Sample usage:
* $ gcc -Wall -std=gnu99 -g -o split_array split_array.c
* $ ./split_array 1 2 3
* Original array:
* 1 2 3
* result[0]:
* 1 3
* result[1]:
* 2
*/
/* Return a pointer to an array of two dynamically allocated arrays of ints.
The first array contains the elements of the input array s that are
at even indices. The second array contains the elements of the input
array s that are at odd indices.
Do not allocate any more memory than necessary. You are not permitted
to include math.h. You can do the math with modulo arithmetic and integer
division.
*/
int **split_array(const int *s, int length) {
int **ptr;
int half;
half = length / 2;
ptr[0] = malloc(sizeof(int) * half);
ptr[1] = malloc(sizeof(int) * (half+1));
for (int i = 0; i < length; i++) {
if (i == (length - 1) && length % 2 == 1) {
(ptr[0])[i] = s[1+i];
}
(ptr[0])[i] = s[1+i];
(ptr[1])[i] = s[2+i];
}
return ptr;
}
/* Return a pointer to an array of ints with size elements.
- strs is an array of strings where each element is the string
representation of an integer.
- size is the size of the array
*/
int *build_array(char **strs, int size) {
int *p = malloc(sizeof(int) * size);
for (int i = 0; i < size; i++) {
p[0] = strtol(strs[1+i], NULL, 10);
}
return p;
}
int main(int argc, char **argv) {
/* Replace the comments in the next two lines with the appropriate
arguments. Do not add any additional lines of code to the main
function or make other changes.
*/
int *full_array = build_array(argv, argc - 1);
int **result = split_array(full_array, argc - 1);
printf("Original array:\n");
for (int i = 0; i < argc - 1; i++) {
printf("%d ", full_array[i]);
}
printf("\n");
printf("result[0]:\n");
for (int i = 0; i < argc / 2; i++) {
printf("%d ", result[0][i]);
}
printf("\n");
printf("result[1]:\n");
for (int i = 0; i < (argc - 1) / 2; i++) {
printf("%d ", result[1][i]);
}
printf("\n");
free(full_array);
free(result[0]);
free(result[1]);
free(result);
return 0;
}
| null | null |
63c648305f004bf4898cfa40 | 2023-01-26T23:48:04.668Z | Explain Code | v1 | null | !(n = strtol(argv[1], NULL, 10)) | null | null |
63c648305f004bf4898cfa40 | 2023-01-27T02:46:14.673Z | General Question | v1 | how to read standard input? | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-27T03:10:32.695Z | Explain Code | v1 | null | #include <string.h>
int main() {
char str1[20] = "Hello";
char str2[20] = "World";
printf("str1: %s", str1);
printf("str2: %s", str2);
strncpy(str1, str2, 3);
printf("str1: %s", str1);
printf("str2: %s", str2);
return 0;
}
| null | null |
63c648305f004bf4898cfa40 | 2023-01-27T15:52:42.258Z | General Question | v1 | what scanf can do? | null | null | null |
63c648305f004bf4898cfa40 | 2023-01-27T16:32:41.137Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
/*
* Sample usage:
* $ gcc -Wall -std=gnu99 -g -o count_large count_large.c
* $ count_large 1000
* 0
* $ ./fibo 2
* 0 1
*/
// TODO: Implement a helper named check_permissions that matches the prototype below.
int check_permissions(char *perm, char *req) {
char p[3];
p[0] = req[0];
p[1] = req[1];
p[2] = req[2];
for (int i ; i < 3; i++) {
// handle r
if (p[0] == perm[i*3]) {p[0] = '-';}
else if (i < 2) {p[0] = req[(i+1)*3];}
// handle w
if (p[1] == perm[i*3 + 1]) {p[1] = '-';}
else if (i < 2) {p[0] = req[(i+1)*3 + 1];}
// handle x
if (p[2] == perm[i*3 + 2]) {p[2] = '-';}
else if (i < 2) {p[0] = req[(i+1)*2 + 2];}
// check if permissions are all meet
if (p[0] == '-' && p[1] == '-' && p[2] == '-') {
return 0;
}
}
return 1;
};
int main(int argc, char** argv) {
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
int count = 0;
int n, di, size;
char req[9], p[10], user[31], group[31], m[31], d[31], y[31], f[31];
// TODO: Process command line arguments.
n = strtol(argv[1], NULL, 10);
if (argc == 3) {req = argv[2];}
// TODO: Call check_permissions as part of your solution to count the files to
// compute and print the correct value.
scanf("%s", &f);
while (scanf("%s %d %s %s %d %s %s %s %s",
p, &di, user, group, &size, m, d, y, f) != EOF) {
if (argc == 3 && !check_permissions(p+1, req) && n < size ) {
count++;
} else if (n < size){
count++;
}
}
printf('%d/n', count);
return 0;
} | a C program called count_large. The program will inspect the output from the ls -l command and print the number of files larger than a specified size. | null |
63c648305f004bf4898cfa40 | 2023-01-27T16:36:20.223Z | Explain Code | v1 | null | int check_permissions(char *perm, char *req) {
char p[3];
p[0] = req[0];
p[1] = req[1];
p[2] = req[2];
for (int i ; i < 3; i++) {
// handle r
if (p[0] == perm[i*3]) {p[0] = '-';}
else if (i < 2) {p[0] = req[(i+1)*3];}
// handle w
if (p[1] == perm[i*3 + 1]) {p[1] = '-';}
else if (i < 2) {p[0] = req[(i+1)*3 + 1];}
// handle x
if (p[2] == perm[i*3 + 2]) {p[2] = '-';}
else if (i < 2) {p[0] = req[(i+1)*2 + 2];}
// check if permissions are all meet
if (p[0] == '-' && p[1] == '-' && p[2] == '-') {
return 0;
}
}
return 1;
}; | null | null |
63c648305f004bf4898cfa40 | 2023-01-27T16:52:40.464Z | Explain Code | v1 | null | int main(int argc, char** argv) {
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
int count = 0;
int n, di, size;
char req[9], p[10], user[31], group[31], m[31], d[31], y[31], f[31];
// TODO: Process command line arguments.
n = strtol(argv[1], NULL, 10);
if (argc == 3) {req = argv[2];}
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-27T21:32:22.700Z | Explain Code | v1 | null | int populate_array(int sin, int *sin_array) {
int a = sin;
for (int i=0; i<9;i++) {
sin_array[i] = sin % 10;
a = (a - sin % 10)/10;
}
return 0;
} | null | null |
63c648305f004bf4898cfa40 | 2023-01-28T02:16:20.829Z | Question from Code | v1 | does the string holiday has '\0' at the end? | char holiday[20] = "Valentine's Day"; | null | null |
63c648305f004bf4898cfa40 | 2023-01-28T02:17:39.290Z | Question from Code | v1 | does alphabet has '\0' at the end? | char alphabet[] = "abcdef"; | null | null |
63c648305f004bf4898cfa40 | 2023-03-03T16:43:57.942Z | 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);
int r;
for (int i = 0; i < iterations; i++) {
if ((r = fork()) < 0) {
perror("fork");
exit(1);
} else if (r == 0) {
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
exit(0);
}
// printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c648335f004bf4898cfa5e | 2023-01-17T23:58:14.126Z | General Question | v1 | how would I restrict a standard input to a string with a limited number of characters in C
| null | null | null |
63c648335f004bf4898cfa5e | 2023-01-18T00:02:55.039Z | General Question | v1 | what is the format specifier for integers in scanf? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-18T00:38:30.643Z | General Question | v1 | where can I find the man page for scanf? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T00:12:05.112Z | General Question | v1 | does C allow comparison of two chars using > or <?
| null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T00:14:29.781Z | General Question | v1 | what character is used to show that a file lacks a certain permission in the notation of ls -l ? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T00:22:07.571Z | General Question | v1 | where can I find the man page for scanf? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T00:56:01.669Z | General Question | v1 | can scanf read string inputs without converting them to a variable? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T01:26:36.879Z | General Question | v1 | what is the format of an assignment statement for a string? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T01:47:00.344Z | General Question | v1 | how would I restrict the size of a string being read by scanf? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T02:37:38.128Z | General Question | v1 | what value is used for a command line argument if it is not provided? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T05:27:12.963Z | General Question | v1 | how can I suppress assignment when using scanf? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T05:28:22.283Z | General Question | v1 | what symbol does scanf use to represent whitespace characters? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T05:38:03.593Z | General Question | v1 | please generate a detailed documentation of `*` as an assignment-suppression character for scanf with usage examples and explanations | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T05:56:52.459Z | General Question | v1 | how would I use scanf to read input from a line containing multiple subtrings separated by spaces? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T06:01:11.454Z | General Question | v1 | how would I use scanf to read the first character and remaining characters of a line separately? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T06:07:35.337Z | General Question | v1 | is the leading character in the permissions of ls -l treated as whitespace? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T06:08:22.686Z | General Question | v1 | what leading characters does ls -l use in the permissions portion of its output? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T06:42:20.713Z | General Question | v1 | can two chars from a string be compared using >? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T07:23:20.850Z | General Question | v1 | why does an unused variable warning appear after compilation? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T07:34:42.046Z | General Question | v1 | given arrays as inputs to a function in the form of pointers, how should I access the variable at a specific index? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T16:47:23.205Z | General Question | v1 | does dividing two ints round or floor the result in C? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-24T23:16:29.841Z | General Question | v1 | how can a .c file use functions from another .c file in the same directory? | null | null | null |
63c648335f004bf4898cfa5e | 2023-01-25T22:54:14.539Z | General Question | v1 | can I get the size of an array in C? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-01T00:21:48.459Z | General Question | v1 | where can I find the man page for malloc?
| null | null | null |
63c648335f004bf4898cfa5e | 2023-02-02T20:27:51.042Z | General Question | v1 | is int a struct in C? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-02T20:28:54.222Z | General Question | v1 | where can I find the man page for typedef?
| null | null | null |
63c648335f004bf4898cfa5e | 2023-02-02T20:32:42.031Z | General Question | v1 | can typedef be used on primitives? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T00:47:23.923Z | General Question | v1 | do structs get initialized to NULL by default?
| null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T00:48:16.793Z | General Question | v1 | does C have a function to check the type of a variable? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T06:35:04.088Z | General Question | v1 | does strncpy's _Count parameter correspond to the number of characters before adding a null terminator or including the null terminator? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T06:49:07.202Z | General Question | v1 | what does fopen return if the file does not exist?
| null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T06:58:20.718Z | General Question | v1 | do I still need to use fclose if fopen returns NULL? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T07:28:08.463Z | General Question | v1 | what happens with strstr if the second argument is longer than the first argument? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T09:07:14.567Z | General Question | v1 | what can I use to open and then print the contents of an ASCII file? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T09:10:40.951Z | General Question | v1 | does the format specifier for a character include whitespace and newline characters? | null | null | null |
63c648335f004bf4898cfa5e | 2023-02-14T09:11:56.922Z | General Question | v1 | what mode needs to be specified to read an ASCII file? | null | null | null |
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