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stringlengths 24
24
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stringlengths 24
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stringclasses 5
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stringclasses 2
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stringlengths 1
1.24k
⌀ | input_code
stringlengths 2
18.5k
⌀ | input_intention
stringlengths 1
2.48k
⌀ | input_task_description
stringlengths 18
3.32k
⌀ |
|---|---|---|---|---|---|---|---|
63c648395f004bf4898cfa95 | 2023-01-28T03:00:00.540Z | General Question | v1 | write a scanf format string that only reads the second line of stdin | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T03:19:40.834Z | Question from Code | v1 | does this compile? what does it do? | int num;
scanf("%[^d]%d", &num); | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T03:20:18.581Z | General Question | v1 | how do read until a character in scanf | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T03:26:30.695Z | General Question | v1 | format specifier for int
| null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T03:27:42.392Z | General Question | v1 | how to I read all consecutive integers from input? | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T03:33:17.658Z | General Question | v1 | suppose stdin = "a b c 123 d" what would my scanf function call be to assign 123 to the variable num | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T04:42:46.028Z | General Question | v1 | suppose we call scanf("%d", &num); on stdin "123". what will the value of num be? | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T15:02:11.740Z | Help Fix Code | v1 | null | count_large.c:25:50: warning: format specifies type 'char *' but the argument has type 'int *' [-Wformat]
done = scanf("%[^n] %*s %*s %*s %*s %d", &size);
~~~~ ^~~~~
%d
count_large.c:25:46: warning: more '%' conversions than data arguments [-Wformat-insufficient-args]
done = scanf("%[^n] %*s %*s %*s %*s %d", &size); | explain the warnings | null |
63c648395f004bf4898cfa95 | 2023-01-28T15:02:40.595Z | General Question | v1 | explain the warnings | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T15:04:49.350Z | General Question | v1 | what is the format specifier to skip until the next newline | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T15:14:20.523Z | General Question | v1 | write code to read a string from stdin using scanf and write it to a variable my_string | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T15:17:29.816Z | General Question | v1 | give the string "-rw-r--r-- 4 joshualunger staff 763 27 Jan 17:01 Makefile" as standard input write a scanf function call to assign 763 to the variable "number" | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:07:56.859Z | Question from Code | v1 | why would this return a segmentation fault? | char *word1 = NULL;
char *word2 = NULL;
char *word3 = NULL;
char *word4 = NULL;
int size;
done = scanf("%s %s %s %s %d", word1, word2, word3, word4, &size);
printf("%s\n%s\n%s\n%s\n%d", word1, word2, word3, word4, size);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:08:49.256Z | Question from Code | v1 | how do i allocated memory for the pointers so this is not a segmentation fault? | char *word1 = NULL;
char *word2 = NULL;
char *word3 = NULL;
char *word4 = NULL;
int size;
done = scanf("%s %s %s %s %d", word1, word2, word3, word4, &size);
printf("%s\n%s\n%s\n%s\n%d", word1, word2, word3, word4, size);
char *word1 = NULL;
char *word2 = NULL;
char *word3 = NULL;
char *word4 = NULL;
int size;
done = scanf("%s %s %s %s %d", word1, word2, word3, word4, &size);
printf("%s\n%s\n%s\n%s\n%d", word1, word2, word3, word4, size);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:09:50.728Z | General Question | v1 | do we have to use allocated memory to assign strings with scanf? | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:11:29.835Z | Question from Code | v1 | why do we need to allocate memory for the pointers in this code? | char *word1 = NULL;
char *word2 = NULL;
char *word3 = NULL;
char *word4 = NULL;
int size;
done = scanf("%s %s %s %s %d", word1, word2, word3, word4, &size);
printf("%s\n%s\n%s\n%s\n%d", word1, word2, word3, word4, size); | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:17:36.918Z | General Question | v1 | do we always need to allocate memory when declaring a string if we don't want it to be a global variable in order to ensure there is not a segmentation fault? | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T17:17:55.102Z | General Question | v1 | do we always need to allocate memory when declaring a string if we don't want it to be a global variable? | null | null | null |
63c648395f004bf4898cfa95 | 2023-01-28T18:52:52.051Z | Help Fix Code | v1 | null |
int total;
int done;
done = scanf("%*s %d %*c", &total);
printf("%d\n%d\n", total, done);
int size = malloc(sizeof(int));
done = scanf("%*s %*s %*s %*s %d", size);
printf("%d\n%d\n", size, done);
| given the stdin "total 320
-rw-r--r-- 4 joshualunger staff 763 27 Jan 17:01 Makefile
-rwxr-xr-x 1 joshualunger staff 33560 27 Jan 22:24 count_large
" return 310\n1\n763\n1 to stdin | null |
63c648395f004bf4898cfa95 | 2023-01-28T20:35:35.798Z | Question from Code | v1 | suppose we pass "total 320
-rw-r--r-- 4 joshualunger staff 763 27 Jan 17:01 Makefile
-rwxr-xr-x 1 joshualunger staff 33560 27 Jan 22:24 count_large
" to stdin and run this code. Why do we get a segmentation fault? | int total;
int done;
done = scanf("%*s %d %*c", &total);
printf("%d\n%d\n", total, done);
int size = malloc(sizeof(int));
done = scanf("%*s %*s %*s %*s %d", &size);
printf("%d\n%d\n", size, done);
done = scanf("%[^\n] %*s %*s %*s %*s %d", &size);
printf("%d\n%d\n", size, done);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T20:36:24.666Z | Question from Code | v1 | where does scanf write to memory it doesn't own? | int total;
int done;
done = scanf("%*s %d %*c", &total);
printf("%d\n%d\n", total, done);
int size = malloc(sizeof(int));
done = scanf("%*s %*s %*s %*s %d", &size);
printf("%d\n%d\n", size, done);
done = scanf("%[^\n] %*s %*s %*s %*s %d", &size);
printf("%d\n%d\n", size, done);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T21:04:15.561Z | Question from Code | v1 | why does this give error: expected identifer? | int size;
done = scanf("%*s %*s %*s %*s %d %*s %*s %*s %*s", &size);
if (done == 1) && (size > max_size){
num_large += 1;
}
}
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T21:14:25.445Z | Question from Code | v1 | why does this give a warning | strtol(argv, Null, 10);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T21:14:51.322Z | Question from Code | v1 | why does this give a warning about argv? | strtol(argv, NULL, 10);
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T21:17:37.777Z | Question from Code | v1 | suppose we run this code with "345" as argv[1]. why does it print "3450"? | int max_size = strtol(argv[1], NULL, 10);
printf("%d", max_size);
int num_large = 0;
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T23:15:26.479Z | Question from Code | v1 | why doesn't this compile | int main(int argc, char** argv){
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
printf("line19\n");
// initialize program variables
int max_size = (int)strtol(argv[1], NULL, 10);
int num_large = 0;
int num_large_permissions = 0;
int total;
int done;
// initialize req_permissions
char *req_permissions = NULL;
if(argv[2] != NULL){
for (int i = 0; i < 9; i++){
req_permissions[i] = argv[2][i];
}
}
// discard total data
done = scanf("%*s %d %*c", &total);
printf("line38\n");
printf("done %d", done);
// iterate over lines
while (done == 1){
printf("initializing size, permissions);
int size;
char *permissions = NULL;
printf("about to scan");
done = scanf("%*c %s %*s %*s %*s %d %*s %*s %*s %*s", permissions, &size);
printf("while loop\n");
if ((done == 1) && (size > max_size)){
num_large += 1;
if((argc == 2) && (check_permissions(req_permissions, permissions) == 0)){
num_large -= 1;
}
}
}
printf("%d", num_large);
return 0;
}
| null | null |
63c648395f004bf4898cfa95 | 2023-01-28T23:16:40.919Z | Question from Code | v1 | why doesn't this compile? | #include <stdio.h>
#include <stdlib.h>
// check_permissions
int check_permissions(char *req_permissions, char *permissions){
for(int i = 0; i < 9; i++){
if((req_permissions[i] != 13) && (permissions[i] != req_permissions[i])){return 0;}
}
return 1;
}
// main method
int main(int argc, char** argv){
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
printf("line19\n");
// initialize program variables
int max_size = (int)strtol(argv[1], NULL, 10);
int num_large = 0;
int num_large_permissions = 0;
int total;
int done;
// initialize req_permissions
char *req_permissions = NULL;
if(argv[2] != NULL){
for (int i = 0; i < 9; i++){
req_permissions[i] = argv[2][i];
}
}
// discard total data
done = scanf("%*s %d %*c", &total);
printf("line38\n");
printf("done %d", done);
// iterate over lines
while (done == 1){
printf("initializing size, permissions);
int size;
char *permissions = NULL;
printf("about to scan");
done = scanf("%*c %s %*s %*s %*s %d %*s %*s %*s %*s", permissions, &size);
printf("while loop\n");
if ((done == 1) && (size > max_size)){
num_large += 1;
if((argc == 2) && (check_permissions(req_permissions, permissions) == 0)){
num_large -= 1;
}
}
}
printf("%d", num_large);
return 0;
}
| null | null |
63c648395f004bf4898cfa95 | 2023-01-30T20:12:46.891Z | Question from Code | v1 | don't lines 2 and 3 not actually change s1? | char s1[22] = "Cat got your tongue?";
char s2[2] = "\0";
strncat(s1, s2, 1);
printf("%s", s1); | null | null |
63c648395f004bf4898cfa95 | 2023-02-12T22:05:29.034Z | Help Fix Code | v1 | null | if((User *new_user = malloc(sizeof(User))) == NULL){return 0;} | initialize a User struct on the heap and pass the address to new_user. If there is no memory available, return 0. | null |
63c6483a5f004bf4898cfa9a | 2023-04-25T19:55:34.222Z | General Question | v2 | multiple process can use the same port to listen for connections | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-01-27T05:21:08.693Z | Help Fix Code | v1 | null | void fib(int **seq, int n){
int *sequence = malloc(sizeof(int*) * n);
*seq = sequence;
*seq[0] = 0;
*seq[1] = 1;
int i = 2;
while (i<=n){
*seq[i] =*seq[i-2] + *seq[i-1];
}
} | update seq | null |
63c6483b5f004bf4898cfaa9 | 2023-01-30T23:04:54.140Z | Help Fix Code | v1 | null | int main(int argc, char** argv) {
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
// TODO: Process command line arguments.
//
int limit;
limit = strtol(argv[1], NULL, 10);
char *permission[9];
// scanf("%10s", permission);
permission = &argv[2];
char* files;
scanf("%32s", files);
// TODO: Call check_permissions as part of your solution to count the files to
// compute and print the correct value.
int return_value = 0;
scanf("%s", files);
while (files[0] != 'E' ){
if (files[0] != 'd' ){
char *leftover;
int size_file = strtol(files, &leftover, 10);
char *file_permission[9];
file_permission = &files[1];
if (check_permissions(*file_permission,*permission) != 1 && size_file < limit ){
return_value ++;
}
}
scanf("%s", files);
}
printf("%d", return_value);
return 0;
} | input permission given from command arguments | null |
63c6483b5f004bf4898cfaa9 | 2023-01-30T23:09:35.285Z | Help Fix Code | v1 | null | int main(int argc, char** argv) {
if (!(argc == 2 || argc == 3)) {
fprintf(stderr, "USAGE: count_large size [permissions]\n");
return 1;
}
// TODO: Process command line arguments.
//
int limit;
limit = strtol(argv[1], NULL, 10);
char *permission[9];
// scanf("%10s", permission);
permission = argv[2];
char* files[32];
scanf("%32s", *files);
// TODO: Call check_permissions as part of your solution to count the files to
// compute and print the correct value.
int return_value = 0;
scanf("%s", *files);
while (files[0] != 'E' ){
if (files[0] != 'd' ){
char *leftover;
int size_file = strtol(files, &leftover, 10);
char *file_permission[9];
file_permission = files[1];
if (check_permissions(*file_permission,*permission) != 1 && size_file < limit ){
return_value ++;
}
}
scanf("%s", *files);
}
printf("%d", return_value);
return 0;
} | assign permission based on command line input | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T21:36:10.663Z | General Question | v2 | write to file integers 1 to 100 in binary form | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T21:58:37.521Z | General Question | v2 | random(100) | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:04:56.298Z | General Question | v2 | seek to a random location in the file | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:06:17.635Z | Help Write Code | v2 | null | null | null | seek to a random location in the file |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:07:26.850Z | General Question | v2 | seek to a random location in the file | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:11:00.894Z | General Question | v2 | seek to a random location in the file and print its value | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:12:50.637Z | General Question | v2 | Now, use sigactionLinks to an external site. to add a signal handler to your program. Start with something simple that just prints a message to standard out and exits (with termination code 0) when it receives a SIGPROF. Then, to test it, run your program and use kill to send it a SIGPROF signal from the shell in another terminal window. (Check the man page for killLinks to an external site. to see how to get a listing of signals and their numbers.)
| null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:14:34.716Z | General Question | v2 | SIGPROF() usage | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:17:11.823Z | General Question | v2 | sigaction() usage | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:19:01.060Z | General Question | v2 | Now, use sigactionLinks to an external site. to add a signal handler to your program. Start with something simple that just prints a message to standard out and exits (with termination code 0) when it receives a SIGPROF. | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-17T22:24:40.663Z | General Question | v2 | set field sa_handler of sa to signal_handler | null | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-31T21:03:42.603Z | Help Write Code | v2 | null | null | null | test malloc fail or not |
63c6483b5f004bf4898cfaa9 | 2023-03-31T21:16:28.573Z | Help Fix Code | v2 | access the username attribute of users[fd] which is the fd th user in a list of sturcts | char* echo_msg = "%s:%s", users[fd].username, buf; | null | null |
63c6483b5f004bf4898cfaa9 | 2023-03-31T21:22:18.503Z | Help Write Code | v2 | null | null | null | concatenate username, and message with ":" in the middle and sent it through a socket |
63c6483c5f004bf4898cfaae | 2023-01-20T19:15:34.729Z | General Question | v1 | how does scans() work? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-01-20T19:16:36.094Z | General Question | v1 | how could I end scanf() when it is at the end of the file? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-01-20T19:18:15.782Z | Explain Code | v1 | null | int main(int argc, char **argv) {
// Read in the command-line arguments and convert the strings to doubles
double principal = strtod(argv[1], NULL);
double rate = strtod(argv[2], NULL);
// Call invest to make you more money
invest(&principal, rate);
printf("%.2f\n", principal);
return 0;
}
| null | null |
63c6483c5f004bf4898cfaae | 2023-01-26T20:07:37.861Z | Help Fix Code | v1 | null | void fib(int **sequence, int n){
// allocate space
int **sequence = malloc(sizeof(int *));
int sequence[0] = malloc(sizeof(int) * n);
/* set the first two elements */
sequence[0][0] = 0;
sequence[0][1] = 1;
/* the rest of the sequence */
for (int i = 2; i < n; i++){
sequence[0][i] = sequence[0][i-2] + sequence[0][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;
}
| Define a function void fib(...) below. This function takes parameter n
* and generates the first n values in the Fibonacci sequence. Recall that this
* sequence is defined as:
* 0, 1, 1, 2, 3, 5, ... , fib[n] = fib[n-2] + fib[n-1], ...
* The values should be stored in a dynamically-allocated array composed of
* exactly the correct number of integers. The values should be returned
* through a pointer parameter passed in as the first argument.
*
* See the main function for an example call to fib.
* Pay attention to the expected type of fib's parameters. | null |
63c6483c5f004bf4898cfaae | 2023-02-10T22:39:15.331Z | General Question | v1 | how to check my code pointing to image files? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-02-14T17:56:23.250Z | General Question | v1 | How to cast a type to another in c? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-02-14T18:47:22.919Z | General Question | v1 | expected ‘const char * restrict’ but argument is of type ‘char’ | null | null | null |
63c6483c5f004bf4898cfaae | 2023-02-14T18:51:23.722Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
// Check whether the given name could fit in the 'name' array
if (strlen(name) + 1 >= MAX_NAME) {
return 2;
}
// Check if the given name already exists in the list
// Move to the next item in the linked list by 'next'
while ((**user_ptr_add).next != NULL) {
if ((**user_ptr_add).name == name) {
return 1;
}
}
// Insert the user if the given name is valid
// Copy the name
strncpy((**user_ptr_add).name, name, MAX_NAME - 1);
// Initiate the other elements
(**user_ptr_add).first_post = NULL;
// For the linked list of friends set the first element to NULL
*(**user_ptr_add).friends = NULL;
(**user_ptr_add).next = NULL;
// Return the code if successfully run
return 0;
}
| create a user with type of struct User | null |
63c6483c5f004bf4898cfaae | 2023-03-03T20:33:14.828Z | General Question | v1 | how to prevent a child process creating new processes | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-03T20:56:59.420Z | General Question | v1 | how to use makefile to compile a specific file | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-03T22:16:19.669Z | General Question | v1 | how to end a void function
| null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-03T22:27:58.174Z | General Question | v1 | How do we create child process from child process | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-10T22:10:05.208Z | Help Fix Code | v2 | check if username or password is too long | // If username is too long
fgets(user_id, MAXLINE, stdin);
if(strlen(user_id) > MAX_PASSWORD + 1) {
printf(NO_USER);
exit(1);
}
// If password is too long
fgets(password, MAXLINE, stdin);
if(strlen(password) > MAX_PASSWORD + 1) {
printf(NO_USER);
exit(1);
}
| null | null |
63c6483c5f004bf4898cfaae | 2023-03-17T19:11:16.557Z | General Question | v2 | how to write random numbers to a file | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-17T19:25:41.437Z | General Question | v2 | how to use -vtu4 flag in od to display contents of a binary file? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-24T19:08:50.075Z | General Question | v2 | Could you explain the parameters in read() function? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-24T19:47:02.133Z | General Question | v2 | How does memmove() work? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-28T17:51:22.221Z | General Question | v2 | How to write a message from stdin to socket? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-28T18:02:08.662Z | General Question | v2 | how does a server broadcast messages to its connected clients? | null | null | null |
63c6483c5f004bf4898cfaae | 2023-03-31T21:52:53.095Z | Help Fix Code | v2 | Monitor stdin and the socket using select to avoid blocking on either one. | fd_set read_fds;
FD_ZERO(&read_fds);
FD_SET(sock_fd, &read_fds);
FD_SET(STDIN_FILENO, &read_fds);
// Read input from the user and send it to the server. Echo any output
// received from the server.
while (1) {
// Read from server
if (FD_ISSET(sock_fd, &read_fds)) {
num_read = read(sock_fd, buf, BUF_SIZE);
}
// Read from stdin
if (FD_ISSET(STDIN_FILENO, &read_fds)) {
num_read = read(STDIN_FILENO, buf, BUF_SIZE);
}
if (num_read == 0) {
break;
}
buf[num_read] = '\0';
/*
* We should really send "\r\n" too, so the server can identify partial
* reads, but you are not required to handle partial reads in this lab.
*/
if (write(sock_fd, buf, num_read) != num_read) {
perror("client: write");
close(sock_fd);
exit(1);
}
num_read = read(sock_fd, buf, sizeof(buf) - 1);
if (num_read == 0) {
break;
}
buf[num_read] = '\0';
printf("[Server] %s", buf);
}
close(sock_fd);
return 0;
| null | null |
63c6483c5f004bf4898cfab3 | 2023-01-18T16:12:04.913Z | General Question | v1 | c_helper.py:148: in _t
self.assertEqual(stdout, expected_stdout)
E AssertionError: '125' != '1\n6\n4161234567\n3'
E - 125
E + 1
E 6
E 4161234567
E 3
what is wrong with the code? | null | null | null |
63c6483c5f004bf4898cfab3 | 2023-01-18T16:18:51.771Z | Help Fix Code | v1 | null | #include <stdio.h>
int main() {
char str1[11];
int num;
while(scanf("%s\n", str1)==1){
scanf("%d", &num);
if (num==-1){
printf("%s\n", str1);
}else if (num >=0 && num <=9){
printf("%c\n", str1[num]);
}else if (num < -1 || num >9){
printf("ERROR\n");
}
}
return 0;
} | keep asking user for input until input stream is closed | null |
63c6483c5f004bf4898cfab3 | 2023-01-18T16:29:28.002Z | Question from Code | v1 | c_helper.py:148: in _t
self.assertEqual(stdout, expected_stdout)
E AssertionError: '1\n2\n5' != '1\n6\n4161234567\n3'
E 1
E - 2
E - 5+ 6
E + 4161234567
E + 3
How to get this test to pass? | #include <stdio.h>
int main() {
char str1[11];
int num;
while(scanf("%s\n", str1)==1){
scanf("%d", &num);
if (num==-1){
printf("%s\n", str1);
}else if (num >=0 && num <=9){
printf("%c\n", str1[num]);
}else if (num < -1 || num >9){
printf("ERROR\n");
}
}
return 0;
} | null | null |
63c6483c5f004bf4898cfab3 | 2023-01-18T16:30:48.853Z | Question from Code | v1 | c_helper.py:148: in _t self.assertEqual(stdout, expected_stdout) E AssertionError: '1\n2\n5' != '1\n6\n4161234567\n3' E 1 E - 2 E - 5+ 6 E + 4161234567 E + 3
Why is my code returning the wrong output? | #include <stdio.h>
int main() {
char str1[11];
int num;
while(scanf("%s\n", str1)==1){
scanf("%d", &num);
if (num==-1){
printf("%s\n", str1);
}else if (num >=0 && num <=9){
printf("%c\n", str1[num]);
}else if (num < -1 || num >9){
printf("ERROR\n");
}
}
return 0;
} | null | null |
63c6483c5f004bf4898cfab3 | 2023-01-18T16:36:32.631Z | Help Fix Code | v1 | null | #include <stdio.h>
int main() {
char str1[11];
int num;
while(scanf("%s", str1)==1){
scanf("%d", &num);
if (num==-1){
printf("%s\n", str1);
}else if (num >=0 && num <=9){
printf("%c\n", str1[num]);
}else if (num < -1 || num >9){
printf("ERROR\n");
}
}
return 0;
} | c_helper.py:148: in _t self.assertEqual(stdout, expected_stdout) E AssertionError: '1\n2\n5' != '1\n6\n4161234567\n3' E 1 E - 2 E - 5+ 6 E + 4161234567 E + 3 Why is my code returning the wrong output? | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T21:13:46.862Z | General Question | v1 | why am I getting a segmentation fault?
if (strcmp(curr->name,name)==0){
prev->next=curr->next;
//remove user from friend lists
for(int i=0; i<MAX_FRIENDS;i++){
//find this user within friends' lists
User *f=curr->friends[i];
if(f!=NULL){
int j =0;
while(f->friends[j]!=NULL && strcmp(f->friends[j]->name,name)!=0){
j+=1;
}
if (strcmp(f->friends[j]->name,name)==0){
//shift friends forward to get rid of this user
// while(j<MAX_FRIENDS-1){
// f->friends[j]=f->friends[j+1];
// j+=1;
// }
}
}
}
free(curr);
return 0;
| null | null | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T21:19:29.218Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev=NULL;
//find the user
while(curr!=NULL && strcmp(curr->name,name)!=0){
prev=curr;
curr=curr->next;
}
//remove the user
if (strcmp(curr->name,name)==0){
prev->next=curr->next;
//remove user from friend lists
for(int i=0; i<MAX_FRIENDS;i++){
//find this user within friends' lists
User *f=curr->friends[i];
if(f!=NULL){
int j =0;
while(f->friends[j]!=NULL && strcmp(f->friends[j]->name,name)!=0){
j+=1;
}
if (strcmp(f->friends[j]->name,name)==0){
//shift friends forward to get rid of this user
while(j<MAX_FRIENDS-1){
f->friends[j]=f->friends[j+1];
j+=1;
}
}
}
}
free(curr);
return 0;
}
return 1;
} | remove the user with name from the user_ptr_del | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T21:34:18.558Z | Help Fix Code | v1 | null | int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev=NULL;
//find the user
while(curr!=NULL && strcmp(curr->name,name)!=0){
prev=curr;
curr=curr->next;
}
//remove the user
if (strcmp(curr->name,name)==0){
prev->next=curr->next;
//remove user from friend lists
for(int i=0; i<MAX_FRIENDS;i++){
//find this user within friends' lists
User *f=curr->friends[i];
if(f!=NULL){
int j =0;
while(f->friends[j]!=NULL && strcmp(f->friends[j]->name,name)!=0){
j+=1;
}
if (strcmp(f->friends[j]->name,name)==0){
//shift friends forward to get rid of this user
while(j<MAX_FRIENDS-1){
f->friends[j]=f->friends[j+1];
j+=1;
}
}
}
}
free(curr);
return 0;
}
return 1;
} | The code is supposed to remove the user with name from the list by setting pointer of the previous user before the user with name to the user after the user with name. It also need to delete all of the user with name from the users friends lists. | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T21:48:58.969Z | Help Fix Code | v1 | null | if (strcmp(curr->name,name)==0){
//remove user from friend lists
for(int i=0; i<MAX_FRIENDS;i++){
//find this user within friends' lists
User *f=curr->friends[i];
if(f!=NULL){
int j =0;
while(f->friends[j]!=NULL && strcmp(f->friends[j]->name,name)!=0){
j+=1;
}
if (strcmp(f->friends[j]->name,name)==0){
//shift friends forward to get rid of this user
while(j<MAX_FRIENDS-1){
f->friends[j]=f->friends[j+1];
j+=1;
}
}
}
}
prev->next=curr->next;
free(curr);
return 0;
| why is there a seg fault occurring? | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T22:17:06.797Z | Help Fix Code | v1 | null | User *curr = *user_ptr_del;
User *prev=NULL;
//find the user
while(curr!=NULL && strcmp(curr->name,name)!=0){
prev=curr;
curr=curr->next;
}
//remove the user
if (strcmp(curr->name,name)==0){
//remove user from friend lists
for(int i=0; i<MAX_FRIENDS;i++){
//find this user within friends' lists
User *f=curr->friends[i];
if(f!=NULL){
for(int j=0;j<MAX_FRIENDS;j++){ | why am I getting a set fault? | null |
63c6483c5f004bf4898cfab3 | 2023-02-05T22:41:38.987Z | Help Fix Code | v1 | null | User *f=curr->friends[i];
if(f!=NULL){
for(int j=0;j<MAX_FRIENDS;j++){
if (f->friends[j]!=NULL){
}
} | why is there a set fault? | null |
63c6483c5f004bf4898cfab3 | 2023-02-12T16:28:54.706Z | Question from Code | v1 | What will this declaration line become after the program has passed
through the C pre-processor? | 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. | null | null |
63c6483c5f004bf4898cfab3 | 2023-02-24T01:24:31.478Z | General Question | v1 | How to parse file with fgets and fscanf? | null | null | null |
63c6483c5f004bf4898cfab3 | 2023-02-25T03:15:18.971Z | Help Write Code | v1 | null | null | null | how to write a function that will parse a Makefile and separate lines into actions, target, dependencies into linked list structures? |
63c6483c5f004bf4898cfab3 | 2023-03-08T15:12:02.381Z | Question from Code | v1 | what does tt.tv_sec refer to when struct stat st refers to a file? | struct timespec tt;
struct stat st;
tt.tv_sec=st.st_mtime; | null | null |
63c6483c5f004bf4898cfab3 | 2023-03-09T17:00:55.825Z | Help Fix Code | v2 | Why is this giving an error error: member reference base type '__darwin_time_t' (aka 'long') is not a structure or union | #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
int main(){
struct stat sd;
//struct timespec td;
char *path=malloc(9);
strncpy(path, "file.txt",8);
path[8]='\0';
stat(path, &sd);
//td.tv_sec=sd.st_mtime;
printf("%lu.%lu\n",sd.st_mtime, sd.st_mtime.tv_nsec);
return 0;
} | null | null |
63c6483e5f004bf4898cfac7 | 2023-01-18T20:09:39.816Z | Explain Code | v1 | null | int main(int argc, char **argv) {
int size = argc - 1;
int *score_card[size];
for (int i = 0; i < size; i++) {
// NOTE: We haven't covered malloc yet, so don't worry about this line.
score_card[i] = malloc(sizeof(int));
*(score_card[i]) = strtol(argv[i + 1], NULL, 10);
}
printf("Sum: %d\n", sum_card(score_card, size));
return 0;
} | null | null |
63c6483e5f004bf4898cfac7 | 2023-01-18T20:37:37.240Z | General Question | v1 | What determines the return for scanf()? | null | null | null |
63c6483e5f004bf4898cfac7 | 2023-01-29T19:01:54.730Z | General Question | v1 | Why is strcpy() unsafe? | null | null | null |
63c6483f5f004bf4898cfacc | 2023-01-18T01:27:49.083Z | General Question | v1 | what is wrong with my code | null | null | null |
63c6483f5f004bf4898cfacc | 2023-01-18T01:29:17.226Z | Help Fix Code | v1 | null | int main() {
// These variables have been assigned hidden values:
int secret;
int *another_secret;
// Declare a variable named secret_pt and make it point to secret:
int *secret_pt = &secret;
// Add the value pointed to by another_secret to the
// value pointed to by secret_pt.
// Do not change the address assigned to secret_pt, and don't explicitly set secret.
secret_pt = secret_pt + *another_secret;
return 0;
} | Add the value pointed to by another_secret to the
value pointed to by secret_pt. Do not change the address assigned to secret_pt, and don't explicitly set secret. | null |
63c6483f5f004bf4898cfacc | 2023-01-18T01:56:03.306Z | Explain Code | v1 | null | int main() {
int i = 81;
int *pt = &i;
int **pt_ptr = &pt;
int *r= *pt_ptr;
int k = *r;
// We don't actually need the intermediate value r.
// We can dereference pt_ptr twice like this.
int k1 = **pt_ptr;
// We can even have triple pointers.
int ***pt_ptr_ptr = &pt_ptr;
int k2 = ***pt_ptr_ptr;
return 0;
} | null | null |
63c6483f5f004bf4898cfacc | 2023-01-18T01:57:15.800Z | General Question | v1 | on line 7 why does *r = *pt_ptr and not **pt_ptr
| null | null | null |
63c6483f5f004bf4898cfacc | 2023-01-18T02:06:04.148Z | Explain Code | v1 | null | int x = 4;
int *y = &x;
int **z = &y;
int q; | null | null |
63c6483f5f004bf4898cfacc | 2023-01-19T20:09:27.913Z | Explain Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
int allocated_amount;
// Set the value of allocated_amount:
return 0;
} | null | null |
63c6483f5f004bf4898cfacc | 2023-01-19T20:10:18.944Z | General Question | v1 | How to set the allocated_amount variable to the exact amount of space that should be allocated? | null | null | null |
63c6483f5f004bf4898cfacc | 2023-01-19T20:11:09.151Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
int allocated_amount;
// Set the value of allocated_amount:
allocated_amount = malloc(sizeof(int));
return 0;
} | why doesn't this work? | null |
63c6483f5f004bf4898cfacc | 2023-01-19T20:11:34.808Z | Help Fix Code | v1 | null | #include <stdio.h>
#include <stdlib.h>
int main() {
int allocated_amount;
// Set the value of allocated_amount:
*allocated_amount = malloc(sizeof(int));
return 0;
} | null | null |
63c6483f5f004bf4898cfacc | 2023-01-19T20:13:11.658Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
float *rainfall;
float rain_today;
// rainfall has been dynamically allocated space for a floating point number.
// Both rainfall and rain_today have been initialized in hidden code.
// Assign the amount in rain_today to the space rainfall points to.
return 0;
} | null | null |
63c648415f004bf4898cfadb | 2023-01-19T23:05:12.030Z | General Question | v1 | How to check when standard input is closed using scanf? | null | null | null |
63c648415f004bf4898cfadb | 2023-01-27T11:43:28.585Z | Question from Code | v1 | Why does this code give a segmentation fault? | #include <stdlib.h>
#include <stdio.h>
/*
* Define a function void fib(...) below. This function takes parameter n
* and generates the first n values in the Fibonacci sequence. Recall that this
* sequence is defined as:
* 0, 1, 1, 2, 3, 5, ... , fib[n] = fib[n-2] + fib[n-1], ...
* The values should be stored in a dynamically-allocated array composed of
* exactly the correct number of integers. The values should be returned
* through a pointer parameter passed in as the first argument.
*
* See the main function for an example call to fib.
* Pay attention to the expected type of fib's parameters.
*/
/* Write your solution here */
void fib(int **fib_ptr, int n){
*fib_ptr = malloc(sizeof (int) * n);
if (n == 1){
*fib_ptr[0] = 0;
}
else if (n == 2){
*fib_ptr[0] = 0;
*fib_ptr[1] = 1;
}
else{
*fib_ptr[0] = 0;
*fib_ptr[1] = 1;
for (int i = 2; i < n; i++){
*fib_ptr[i] = *fib_ptr[i - 2] + *fib_ptr[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 |
63c648415f004bf4898cfadb | 2023-01-27T18:03:29.109Z | General Question | v1 | How to use strtol? | null | null | null |
63c648415f004bf4898cfadb | 2023-01-27T18:06:53.191Z | General Question | v1 | How to use argc and argv? | null | null | null |
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