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
⌀ |
|---|---|---|---|---|---|---|---|
63c648055f004bf4898cf8bf
|
2023-03-12T21:39:49.962Z
|
Question from Code
|
v2
|
what does this return
|
char line[50];
strcpy(line, " hello");
if (line[0] == \t) {
printf("yay");
}
| null | null |
63c648055f004bf4898cf8bf
|
2023-03-12T22:24:14.703Z
|
Explain Code
|
v2
| null |
char *args_to_string(char **args, char *buffer, int size) {
buffer[0] = '\0';
int i = 0;
while (args[i] != NULL) {
strncat(buffer, args[i], size - strlen(buffer));
strncat(buffer, " ", size - strlen(buffer));
i++;
}
return buffer;
}
| null | null |
63c6480a5f004bf4898cf8ec
|
2023-02-10T13:19:10.261Z
|
General Question
|
v1
|
explain how fseek works
| null | null | null |
63c6480a5f004bf4898cf8ec
|
2023-02-10T19:58:14.882Z
|
General Question
|
v1
|
is there a difference between exit(0) and return 0 from main in C
| null | null | null |
63c6480a5f004bf4898cf8ec
|
2023-02-10T20:00:27.960Z
|
General Question
|
v1
|
how do i free malloced memory
| null | null | null |
63c6480a5f004bf4898cf8ec
|
2023-03-10T19:51:58.564Z
|
General Question
|
v2
|
explain the C dup2 function
| null | null | null |
63c6480c5f004bf4898cf8fb
|
2023-01-31T15:51:12.017Z
|
Question from Code
|
v1
|
what does this print
|
char **build_month_list(){
// char *month1 = malloc(sizeof(char) * 8);
// char *month2 = malloc(sizeof(char) * 9);
// char *month3 = malloc(sizeof(char) * 6);
// strcpy(month1, "January");
// strcpy(month2, "February");
// strcpy(month3, "March");
char month1[] = "January";
char month2[] = "Fenruary";
char month3[] = "March";
char *month_list[3] = {month1, month2, month3};
return &month_list;
}
char **months = build_month_list();
for(int i = 0; i < 3; i++) {
printf("%s ", months[i]);
}
printf("\n");
for(int i = 0; i < 3; i++) {
months[i][3] = '\0';
printf("%s ", months[i]);
}
printf("\n");
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-02T15:16:34.076Z
|
Question from Code
|
v1
|
Have I initialized p1 correctly
|
#define MAX_AREA_SIZE 16
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct faculty {
char *name;
char area[MAX_AREA_SIZE];
int num_students;
};
int main() {
// Declare a struct faculty named p1.
struct faculty p1;
// Initialize p1 to represent Professor Roger Grosse, whose research area
// is ML (Machine Learning). He is supervising 11 graduate students.
strcpy(p1.name, &"Roger Grose");
strcpy(p1.area, "Machine Learning");
p1.num_students = 11;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-02T15:21:36.177Z
|
Question from Code
|
v1
|
Have I initialized p1 correctly
|
#define MAX_AREA_SIZE 16
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct faculty {
char *name;
char area[MAX_AREA_SIZE];
int num_students;
};
int main() {
// Declare a struct faculty named p1.
struct faculty p1;
// Initialize p1 to represent Professor Roger Grosse, whose research area
// is ML (Machine Learning). He is supervising 11 graduate students.
char *prof = malloc(sizeof(char) * 12);
prof = "Roger Grosse";
p1.name = prof;
strcpy(p1.area, "Machine Learning");
p1.num_students = 11;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-02T15:23:11.333Z
|
Question from Code
|
v1
|
Have I initialized p1 correctly
|
#define MAX_AREA_SIZE 16
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct faculty {
char *name;
char area[MAX_AREA_SIZE];
int num_students;
};
int main() {
// Declare a struct faculty named p1.
struct faculty p1;
// Initialize p1 to represent Professor Roger Grosse, whose research area
// is ML (Machine Learning). He is supervising 11 graduate students.
char *prof = malloc(sizeof(char) * 12);
strpy(prof, "Roger Grosse");
p1.name = prof;
strcpy(p1.area, "Machine Learning");
p1.num_students = 11;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-03T02:41:13.146Z
|
Question from Code
|
v1
|
Why does my truncate function not change s
|
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
*/
int truncate(char *s, int n){
// char *temp = s;
int length = strlen(s);
if (length <= n){
return 0;
} else{
s = malloc(sizeof(char) * n);
s[n] = "\0";
return length - n;
}
}
int main(int argc, char **argv) {
/* Do not change the main function */
if (argc != 3) {
fprintf(stderr, "Usage: truncate number string\n");
return 1;
}
int amt = strtol(argv[1], NULL, 10);
char *target = argv[2];
int soln_val = truncate(target, amt);
printf("%d %s\n", soln_val, target);
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-03T02:43:39.994Z
|
Question from Code
|
v1
|
How do I change the value of s
|
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
*/
int truncate(char *s, int n){
// char *temp = s;
int length = strlen(s);
if (length <= n){
return 0;
} else{
// s = malloc(sizeof(char) * n);
s[n] = "\0";
return length - n;
}
}
int main(int argc, char **argv) {
/* Do not change the main function */
if (argc != 3) {
fprintf(stderr, "Usage: truncate number string\n");
return 1;
}
int amt = strtol(argv[1], NULL, 10);
char *target = argv[2];
int soln_val = truncate(target, amt);
printf("%d %s\n", soln_val, target);
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-03T02:51:45.702Z
|
Question from Code
|
v1
|
How do I create the function truncate from the information in lines 6 to 12
|
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
*/
int truncate(char *s, int n){
// char *temp = s;
int length = strlen(s);
if (length <= n){
return 0;
} else{
// s = malloc(sizeof(char) * n);
s[n] = "\0";
return length - n;
}
}
int main(int argc, char **argv) {
/* Do not change the main function */
if (argc != 3) {
fprintf(stderr, "Usage: truncate number string\n");
return 1;
}
int amt = strtol(argv[1], NULL, 10);
char *target = argv[2];
int soln_val = truncate(target, amt);
printf("%d %s\n", soln_val, target);
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-03T02:52:46.568Z
|
Question from Code
|
v1
|
How do I change s in truncate to a different string
|
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
*/
int truncate(char *s, int n){
// char *temp = s;
int length = strlen(s);
if (length <= n){
return 0;
} else{
// s = malloc(sizeof(char) * n);
s[n] = "\0";
return length - n;
}
}
int main(int argc, char **argv) {
/* Do not change the main function */
if (argc != 3) {
fprintf(stderr, "Usage: truncate number string\n");
return 1;
}
int amt = strtol(argv[1], NULL, 10);
char *target = argv[2];
int soln_val = truncate(target, amt);
printf("%d %s\n", soln_val, target);
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-03T02:53:46.594Z
|
Help Fix Code
|
v1
| null |
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
*/
int truncate(char *s, int n){
// char *temp = s;
int length = strlen(s);
if (length <= n){
return 0;
} else{
// s = malloc(sizeof(char) * n);
s[n] = "\0";
return length - n;
}
}
int main(int argc, char **argv) {
/* Do not change the main function */
if (argc != 3) {
fprintf(stderr, "Usage: truncate number string\n");
return 1;
}
int amt = strtol(argv[1], NULL, 10);
char *target = argv[2];
int soln_val = truncate(target, amt);
printf("%d %s\n", soln_val, target);
return 0;
}
|
Write a function named truncate() that takes a string s and a
non-negative integer n. If s has more than n characters (not including the
null terminator), the function should truncate s at n characters and
return the number of characters that were removed. If s has n or
fewer characters, s is unchanged and the function returns 0. For example,
if s is the string "function" and n is 3, then truncate() changes s to
the string "fun" and returns 5.
| null |
63c6480c5f004bf4898cf8fb
|
2023-02-09T06:02:16.610Z
|
Question from Code
|
v1
|
why do I get a segmentation fault in this program
|
int create_user(const char *name, User **user_ptr_add) {
if (strlen(name) >= 32){
return 2;
}
User *curr = *user_ptr_add;
while(curr->next != NULL){
if (strcmp(name, curr->name) == 0){
return 1;
}
curr = curr->next;
}
User new_person;
strcpy(new_person.name, name);
curr->next = &new_person;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-09T06:15:40.485Z
|
Question from Code
|
v1
|
Why am I receiving a segmentation fault
|
int create_user(const char *name, User **user_ptr_add) {
if (strlen(name) >= 32){
return 2;
}
User *curr = *user_ptr_add;
while(curr->next != NULL){
if (strcmp(name, curr->name) == 0){
return 1;
}
curr = curr->next;
}
User *new_person;
new_person = malloc(sizeof(User));
strcpy(new_person->name, name);
curr->next = new_person;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-10T19:14:21.392Z
|
Question from Code
|
v1
|
What is the error in my code
|
struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
struct pixel *values = malloc(sizeof(struct pixel*) * height);
for(int i = 0; i < height; i++){
struct pixel* values[i] = malloc(sizeof(unsigned char) * 3);
}
fseek(image, pixel_array_offset, SEEK_SET);
for(int i = 0; i < height; i++){
for(int j = 0; j < 3; j++){
unsigned char val;
fread(val, sizeof(unsigned char), 1, image);
values[i][j] = val;
}
}
return &values[0];
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-11T18:50:37.176Z
|
Question from Code
|
v1
|
What is wrong with my code
|
int make_friends(const char *name1, const char *name2, User *head) {
User user1 = NULL;
User user2 = NULL;
while(head != NULL){
if (strcmp(name1, head->name) == 0){
user1 = *head;
} else if (strcmp(name2, head->name) == 0){
user2 = *head;
} else{
head = head->next;
}
}
if ((user1 == NULL) || (user2 == NULL)){
return 4;
}
if (strcmp(name1, name2) == 0){
return 3;
}
if ((strlen(user1.friends) == 10) || (strlen(user2.friends) == 10)){
return 2;
}
for(int i = 0; i < strlen(user1.friends); i++){
if (strcmp(name2, user1.friends[i]->name) == 0){
for(int j = 0; j < strlen(user2.friends); j++){
if (strcmp(name1, user2.friends[j]->name) == 0){
return 1;
}
}
}
}
user1.friends[strlen(user1.friends)] = &user2;
user2.friends[strlen(user2.friends)] = &user1;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-11T19:18:47.862Z
|
Question from Code
|
v1
|
What's wrong with my code
|
int make_friends(const char *name1, const char *name2, User *head) {
User *user1 = NULL;
User *user2 = NULL;
while(head != NULL){
if (strcmp(name1, head->name) == 0){
user1 = head;
} else if (strcmp(name2, head->name) == 0){
user2 = head;
} else{
head = head->next;
}
}
if ((user1 == NULL) || (user2 == NULL)){
return 4;
}
if (strcmp(name1, name2) == 0){
return 3;
}
if ((strlen(user1.friends) == 10) || (strlen(user2.friends) == 10)){
return 2;
}
for(int i = 0; i < strlen(user1.friends); i++){
if (strcmp(name2, user1.friends[i]->name) == 0){
for(int j = 0; j < strlen(user2.friends); j++){
if (strcmp(name1, user2.friends[j]->name) == 0){
return 1;
}
}
}
}
user1.friends[strlen(user1.friends)] = &user2;
user2.friends[strlen(user2.friends)] = &user1;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-11T19:22:00.554Z
|
Question from Code
|
v1
|
What's wrong with my code
|
int make_friends(const char *name1, const char *name2, User *head) {
User *user1 = NULL;
User *user2 = NULL;
while(head != NULL){
if (strcmp(name1, head->name) == 0){
user1 = head;
} else if (strcmp(name2, head->name) == 0){
user2 = head;
} else{
head = head->next;
}
}
if ((user1 == NULL) || (user2 == NULL)){
return 4;
}
if (strcmp(name1, name2) == 0){
return 3;
}
if ((strlen(user1.friends) == 10) || (strlen(user2.friends) == 10)){
return 2;
}
for(int i = 0; i < strlen(user1.friends); i++){
if (strcmp(name2, user1.friends[i]->name) == 0){
for(int j = 0; j < strlen(user2.friends); j++){
if (strcmp(name1, user2.friends[j]->name) == 0){
return 1;
}
}
}
}
user1.friends[strlen(user1.friends)] = user2;
user2.friends[strlen(user2.friends)] = user1;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-13T22:12:22.292Z
|
Question from Code
|
v1
|
What does my code print
|
#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)));
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-15T00:06:05.191Z
|
Question from Code
|
v1
|
Why is it that the date stored in now is not correct?
|
int make_post(const User *author, User *target, char *contents) {
if ((author == NULL) || (target == NULL)){
return 2;
}
int author_length = 0;
int target_length = 0;
for (int i = 0; i < 10; i++){
if (author->friends[i] != NULL){
author_length = author_length + 1;
}
}
for (int i = 0; i < 10; i++){
if (author->friends[i] != NULL){
target_length = target_length + 1;
}
}
int are_friends = 0; // are_friends = 1 for no and 0 for yes
for (int i = 0; i < author_length; i++){
if (strcmp(target->name, author->friends[i]->name) == 0){
for (int j = 0; j < target_length; j++){
if (strcmp(author->name, target->friends[i]->name) == 0){
are_friends = 1;
}
}
}
}
if (are_friends == 0){
return 1;
}
Post *new_first_post = malloc(sizeof(Post));
strcpy(new_first_post->author, author->name);
new_first_post->contents = contents;
time_t now = time(NULL);
new_first_post->date = &now;
new_first_post->next = target->first_post;
target->first_post = new_first_post;
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-15T08:37:50.817Z
|
Question from Code
|
v1
|
Why do I get a segmentation fault
|
int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev = NULL;
while((strcmp(name, curr->name) != 0) || (curr != NULL)){
prev = curr;
curr = curr->next;
}
if (curr == NULL){
return 1;
}
if (prev == NULL){
curr->next = NULL;
} else{
prev->next = curr->next;
curr->next = NULL;
}
int length = 0;
for(int i = 0; i < 10; i++){
if (curr->friends[i] != NULL){
length = length + 1;
}
}
for(int i = 0; i < length; i++){
int length2 = 0;
for (int a = 0; a < 10; a++){
if(curr->friends[i]->friends[a] != NULL){
length2 = length2 + 1;
}
}
for(int j = 0; j < length2; j++){
if(strcmp(name, curr->friends[i]->friends[j]->name) == 0){
for (int x = j; x < length2 - 1; x++){
curr->friends[i]->friends[x] = curr->friends[i]->friends[x + 1];
}
curr->friends[i]->friends[length2 - 1] = NULL;
}
}
}
for(int i = 0; i < 10; i++){
// if (curr->friends[i] == NULL){
// free(curr->friends[i]);
// }
free(curr->friends[i]);
}
// Post *curr3 = curr->first_post;
while(curr->first_post != NULL){
free(curr->first_post->author);
free(curr->first_post->contents);
free(curr->first_post->date);
curr->first_post = curr->first_post->next;
}
curr->first_post->next = NULL;
free(curr->name);
free(curr->profile_pic);
free(curr->friends);
free(curr->first_post);
free(curr);
return 0;
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-15T08:39:51.023Z
|
Question from Code
|
v1
|
Why am I getting a segmentation fault
|
int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev = NULL;
while((strcmp(name, curr->name) != 0) || (curr != NULL)){
prev = curr;
curr = curr->next;
}
if (curr == NULL){
return 1;
}
if (prev == NULL){
curr->next = NULL;
} else{
prev->next = curr->next;
curr->next = NULL;
}
int length = 0;
for(int i = 0; i < 10; i++){
if (curr->friends[i] != NULL){
length = length + 1;
}
}
for(int i = 0; i < length; i++){
int length2 = 0;
for (int a = 0; a < 10; a++){
if(curr->friends[i]->friends[a] != NULL){
length2 = length2 + 1;
}
}
for(int j = 0; j < length2; j++){
if(strcmp(name, curr->friends[i]->friends[j]->name) == 0){
for (int x = j; x < length2 - 1; x++){
curr->friends[i]->friends[x] = curr->friends[i]->friends[x + 1];
}
curr->friends[i]->friends[length2 - 1] = NULL;
}
}
}
for(int i = 0; i < 10; i++){
if (curr->friends[i] != NULL){
free(curr->friends[i]);
}
}
// Post *curr3 = curr->first_post;
while(curr->first_post != NULL){
free(curr->first_post->author);
free(curr->first_post->contents);
free(curr->first_post->date);
curr->first_post = curr->first_post->next;
}
curr->first_post->next = NULL;
free(curr->name);
free(curr->profile_pic);
free(curr->friends);
free(curr->first_post);
free(curr);
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-15T09:09:51.577Z
|
Question from Code
|
v1
|
Why do I get an invalid pointer
|
int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev = NULL;
while ((curr != NULL) && (strcmp(name, curr->name) != 0)) {
prev = curr;
curr = curr->next;
}
if (curr == NULL){
return 1;
}
if (prev == NULL) {
*user_ptr_del = curr->next;
} else {
prev->next = curr->next;
curr->next = NULL;
}
int length = 0;
for(int i = 0; (i < 10) && (curr->friends[i] != NULL); i++){
length = length + 1;
}
for(int i = 0; (i < length) && (curr->friends[i] != NULL); i++){
int length2 = 0;
for (int a = 0; (a < 10) && (curr->friends[i]->friends[a] != NULL); a++){
length2 = length2 + 1;
}
for(int j = 0; j < length2; j++){
if(strcmp(name, curr->friends[i]->friends[j]->name) == 0){
for (int x = j; x < length2 - 1; x++){
curr->friends[i]->friends[x] = curr->friends[i]->friends[x + 1];
}
curr->friends[i]->friends[length2 - 1] = NULL;
}
}
}
printf("good");
Post *curr3 = curr->first_post;
while (curr3 != NULL) {
free(curr3->author);
free(curr3->contents);
free(curr3->date);
Post *next_post = curr3->next;
free(curr3);
curr3 = next_post;
}
printf("good");
free(curr->name);
free(curr->profile_pic);
for (int i = 0; i < 10; i++) {
if (curr->friends[i] != NULL) {
free(curr->friends[i]);
}
}
free(curr);
return 0;
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-02-15T09:10:43.205Z
|
Question from Code
|
v1
|
Am I demallocing correctly
|
int delete_user(const char *name, User **user_ptr_del) {
User *curr = *user_ptr_del;
User *prev = NULL;
while ((curr != NULL) && (strcmp(name, curr->name) != 0)) {
prev = curr;
curr = curr->next;
}
if (curr == NULL){
return 1;
}
if (prev == NULL) {
*user_ptr_del = curr->next;
} else {
prev->next = curr->next;
curr->next = NULL;
}
int length = 0;
for(int i = 0; (i < 10) && (curr->friends[i] != NULL); i++){
length = length + 1;
}
for(int i = 0; (i < length) && (curr->friends[i] != NULL); i++){
int length2 = 0;
for (int a = 0; (a < 10) && (curr->friends[i]->friends[a] != NULL); a++){
length2 = length2 + 1;
}
for(int j = 0; j < length2; j++){
if(strcmp(name, curr->friends[i]->friends[j]->name) == 0){
for (int x = j; x < length2 - 1; x++){
curr->friends[i]->friends[x] = curr->friends[i]->friends[x + 1];
}
curr->friends[i]->friends[length2 - 1] = NULL;
}
}
}
printf("good");
Post *curr3 = curr->first_post;
while (curr3 != NULL) {
free(curr3->author);
free(curr3->contents);
free(curr3->date);
Post *next_post = curr3->next;
free(curr3);
curr3 = next_post;
}
printf("good");
free(curr->name);
free(curr->profile_pic);
for (int i = 0; i < 10; i++) {
if (curr->friends[i] != NULL) {
free(curr->friends[i]);
}
}
free(curr);
return 0;
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-03-03T17:31:29.137Z
|
Question from Code
|
v1
|
Why am I getting a warning when I try to wait for the child process to finish (line 24)
|
#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 pid = getpid();
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0){
perror("fork");
exit(1);
} else if (n == 0){
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
exit(0);
} else{
wait(NULL);
}
}
if (getpid() == pid){
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), iterations);
}
return 0;
}
| null | null |
63c6480c5f004bf4898cf8fb
|
2023-03-03T17:32:24.997Z
|
Question from Code
|
v1
|
what should I put in the parameter of wait so that the child process finishes first (line 24)
|
#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 pid = getpid();
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0){
perror("fork");
exit(1);
} else if (n == 0){
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
exit(0);
} else{
wait(NULL);
}
}
if (getpid() == pid){
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), iterations);
}
return 0;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T15:47:31.463Z
|
Question from Code
|
v2
|
Why am I getting a segmentation fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T15:56:54.199Z
|
Question from Code
|
v2
|
Why does this produce a segmentation fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(&(line[0]), ":");
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T15:59:34.455Z
|
Question from Code
|
v2
|
Why is there a segmentation fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(&(line[0]), ":");
if (head_rule != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:03:07.329Z
|
Question from Code
|
v2
|
Why am I still getting a segmentation fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(&(line[0]), ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:37:58.823Z
|
Question from Code
|
v2
|
What is causing the seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(&(line[0]), ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:38:55.058Z
|
Question from Code
|
v2
|
Why does strtok produce a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(&(line[0]), ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:42:03.821Z
|
Question from Code
|
v2
|
Why does line 12 give a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:42:58.783Z
|
Question from Code
|
v2
|
Why does strtok give a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:47:18.826Z
|
Question from Code
|
v2
|
Why does line 24 produce a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
fgets(line, MAXLINE, fp);
while (&(line[0]) != NULL) {
if (is_comment_or_empty(line) == 0 && line[0] != '\t') {
token = strtok(&(line[0]), ":");
Rule *new_rule = add_rule(prev_rule);
head_rule->target = malloc(sizeof(token));
strcpy(new_rule->target, token);
prev_rule->next_rule = new_rule;
prev_rule = new_rule;
}
fgets(line, MAXLINE, fp);
token = strtok(&(line[0]), " ");
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T16:51:04.994Z
|
Question from Code
|
v2
|
Why does strcpy in line 24 cause a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
fgets(line, MAXLINE, fp);
while (&(line[0]) != NULL) {
if (is_comment_or_empty(line) == 0 && line[0] != '\t') {
token = strtok(&(line[0]), ":");
Rule *new_rule = add_rule(prev_rule);
head_rule->target = malloc(sizeof(token));
strcpy(new_rule->target, token);
prev_rule->next_rule = new_rule;
prev_rule = new_rule;
}
fgets(line, MAXLINE, fp);
token = strtok(&(line[0]), " ");
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T17:00:33.628Z
|
Question from Code
|
v2
|
Why does line 24 give a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
fgets(line, MAXLINE, fp);
while (&(line[0]) != NULL) {
if (is_comment_or_empty(line) == 0 && line[0] != '\t') {
token = strtok(&(line[0]), ":");
Rule *new_rule = add_rule(prev_rule);
head_rule->target = malloc(strlen(token) + 1);
strcpy(new_rule->target, token);
prev_rule->next_rule = new_rule;
prev_rule = new_rule;
}
fgets(line, MAXLINE, fp);
token = strtok(&(line[0]), " ");
}
return result;
}
| null | null |
63c648105f004bf4898cf919
|
2023-03-15T17:01:44.910Z
|
Question from Code
|
v2
|
Why does line 24 give a seg fault?
|
Rule *parse_file(FILE *fp) {
Rule *result;
Rule *prev_rule;
char line[MAXLINE];
fgets(&(line[0]), MAXLINE, fp);
Rule *head_rule = malloc(sizeof(Rule));
result = head_rule;
prev_rule = head_rule;
char *token = strtok(line, ":");
if (head_rule != NULL && head_rule->target != NULL) {
head_rule->target = malloc(strlen(token));
strcpy(head_rule->target, token);
}
fgets(line, MAXLINE, fp);
while (&(line[0]) != NULL) {
if (is_comment_or_empty(line) == 0 && line[0] != '\t') {
token = strtok(&(line[0]), ":");
Rule *new_rule = add_rule(prev_rule);
if (head_rule != NULL) {
head_rule->target = malloc(strlen(token) + 1);
strcpy(new_rule->target, token);
}
prev_rule->next_rule = new_rule;
prev_rule = new_rule;
}
fgets(line, MAXLINE, fp);
token = strtok(&(line[0]), " ");
}
return result;
}
| null | null |
63c648115f004bf4898cf928
|
2023-02-08T19:38:24.412Z
|
General Question
|
v1
|
how to initialize the pointer allocated to point to heap-allocated space for an entire row of pixel data.
| null | null | null |
63c648115f004bf4898cf928
|
2023-02-08T19:39:16.902Z
|
Question from Code
|
v1
|
how to initialize the pointer allocated to point to heap-allocated space for an entire row of pixel data.
|
struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
struct pixel **array = malloc (sizeof(struct pixel *) * height);
}
| null | null |
63c648115f004bf4898cf928
|
2023-02-08T19:43:21.201Z
|
Help Fix Code
|
v1
| null |
void read_bitmap_metadata(FILE *image, int *pixel_array_offset, int *width, int *height) {
fseek(image, 10, SEEK_SET);
error = fread(pixel_array_offset,4,1,image);
fseek(image, 18, SEEK_SET);
error = fread(width,4,1,image);
fseek(image, 22, SEEK_SET);
error = fread(height,4,1,image);
}
|
byte 10 - 13 should be the value for pixel_array_offset, byte 18 - 21 should be the value for width and byte 22-25 should be the height.
| null |
63c648115f004bf4898cf928
|
2023-02-08T19:45:07.186Z
|
Help Fix Code
|
v1
| null |
void read_bitmap_metadata(FILE *image, int *pixel_array_offset, int *width, int *height) {
fseek(image, 10, SEEK_SET);
error = fread(pixel_array_offset,4,1,image);
fseek(image, 18, SEEK_SET);
error = fread(width,4,1,image);
fseek(image, 22, SEEK_SET);
error = fread(height,4,1,image);
}
|
pixel_array_offset should assign the value in byte 10 - 13 of the file, byte 18 - 21 should be the value for width should be assigned the value of byte 18 - 21 of the file, height should be assign the value of byte 22-25 of the file
| null |
63c648125f004bf4898cf932
|
2023-01-28T15:56:39.718Z
|
Help Fix Code
|
v1
| null |
char cmd_permission[10];
cmd_permission = argv[2];
|
assign arg[v] to cmd_permission
| null |
63c648125f004bf4898cf932
|
2023-01-28T15:57:40.282Z
|
General Question
|
v1
|
how to assign string to char array
| null | null | null |
63c648125f004bf4898cf932
|
2023-01-28T16:04:18.432Z
|
General Question
|
v1
|
assign string to char array without strcpy()
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-10T00:09:14.977Z
|
Help Fix Code
|
v1
| null |
struct pixel **read_pixel_array(FILE *image, int pixel_array_offset, int width, int height) {
struct pixel *pixel_arr[height];
}
|
initialize an array with height elements
| null |
63c648125f004bf4898cf932
|
2023-02-12T20:03:17.699Z
|
General Question
|
v1
|
how to use gdb with multiple files
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-12T20:03:59.650Z
|
General Question
|
v1
|
how to use gdb
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-12T20:05:55.861Z
|
General Question
|
v1
|
how to run next line in gdb
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-12T22:27:33.276Z
|
General Question
|
v1
|
what does fopen() return if file does not exist?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-12T22:34:00.817Z
|
General Question
|
v1
|
how to go back in gdp?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T00:40:02.155Z
|
General Question
|
v1
|
can i pass a User * type into a const User * type?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T02:20:24.893Z
|
General Question
|
v1
|
can you negative index an array?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T02:26:22.241Z
|
General Question
|
v1
|
can you initialise an array of 0 elements?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T02:32:39.532Z
|
General Question
|
v1
|
how can i set all elements of an array to NULL?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T15:45:43.838Z
|
General Question
|
v1
|
how to run until breakpoint in gdb?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T16:58:34.436Z
|
General Question
|
v1
|
can i set a string to NULL?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T17:20:41.606Z
|
General Question
|
v1
|
ho to print contents of a text file with fopen?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T17:32:46.109Z
|
General Question
|
v1
|
do you have to fclose on a NULL stream?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T17:38:02.878Z
|
General Question
|
v1
|
fgets return value?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T18:23:14.417Z
|
General Question
|
v1
|
how to define char array in function parameter?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-13T18:48:19.484Z
|
General Question
|
v1
|
how to use ctime?
| null | null | null |
63c648125f004bf4898cf932
|
2023-02-15T14:13:03.156Z
|
Help Fix Code
|
v1
| null |
*curr_time = time(NULL);
|
assign the pointer value to time(NULL)
| null |
63c648125f004bf4898cf932
|
2023-02-15T14:14:24.613Z
|
Help Fix Code
|
v1
| null |
time_t *curr_time = malloc(sizeof(time_t));
curr_time = time(NULL);
|
assign the pointer curr_time to the address of time(NULL)
| null |
63c648125f004bf4898cf932
|
2023-03-01T23:16:49.762Z
|
General Question
|
v1
|
does fgets() read empty lines?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-10T22:09:55.786Z
|
General Question
|
v2
|
what is the purpose of NULL passed to execl()?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-10T22:37:05.485Z
|
General Question
|
v2
|
how to write multiple values to a pipe?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-11T18:43:14.770Z
|
General Question
|
v2
|
how can i use strtok() to split on spaces and tabs?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-11T18:49:18.814Z
|
General Question
|
v2
|
how to use strtok() to find comments?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-12T01:13:54.786Z
|
General Question
|
v2
|
can i index a char *pointer?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-12T01:33:20.122Z
|
General Question
|
v2
|
does fgets() read \n character for blank lines?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-12T01:52:16.766Z
|
General Question
|
v2
|
how can i tell if a string starts with a \t tab character?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-12T14:09:32.905Z
|
General Question
|
v2
|
can you compare characters with == ?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-12T19:53:27.868Z
|
General Question
|
v2
|
can i set a struct attribute to a read-only string in a helper function?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-13T01:42:18.355Z
|
General Question
|
v2
|
when should i malloc a string vs just assign it in a helper function?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-13T18:26:20.727Z
|
General Question
|
v2
|
when passing a struct to a function to be modified, should i pass a pointer to struct or a pointer to pointer to struct?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-13T18:40:09.445Z
|
General Question
|
v2
|
how to call strtok repeatedly on the same line?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T02:22:21.090Z
|
General Question
|
v2
|
is there a function to count the number of words in a string?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T02:42:42.654Z
|
General Question
|
v2
|
can you initailize an array of size 0?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T03:28:15.439Z
|
General Question
|
v2
|
what is returned if strtok() is called on a whitespace line?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T03:43:32.687Z
|
General Question
|
v2
|
how to strip a string of specific characters?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T03:47:37.625Z
|
General Question
|
v2
|
does strtok remove tabs when passed " "?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T03:49:21.068Z
|
General Question
|
v2
|
what's the \r character?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T05:06:17.661Z
|
General Question
|
v2
|
what happens if you call strtok() with NULL?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T14:42:21.844Z
|
General Question
|
v2
|
how to strip \n character with gets?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T14:43:04.270Z
|
General Question
|
v2
|
how to strip \n character with fgets?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T15:14:31.866Z
|
General Question
|
v2
|
when does strtok end?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T18:38:27.601Z
|
General Question
|
v2
|
does strncpy copy the null terminator?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T18:42:13.607Z
|
General Question
|
v2
|
how to edit value of a dynamically allocated string?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T23:30:07.098Z
|
General Question
|
v2
|
how to get the size of an array?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-14T23:46:57.591Z
|
General Question
|
v2
|
what type does malloc(sizeof(char *)) return?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-15T00:32:10.411Z
|
General Question
|
v2
|
can i check if a variables been declaared or not?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-15T04:06:28.172Z
|
General Question
|
v2
|
how to use strchr to replace a character with another?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-15T04:08:42.976Z
|
Help Fix Code
|
v2
|
replace \r character with \0
|
if ((newline_index = strchr(curr_line, '\r')) != NULL) {
*newline_index = '\0';
}
| null | null |
63c648125f004bf4898cf932
|
2023-03-15T04:31:41.976Z
|
General Question
|
v2
|
how to clear a character array?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-15T13:21:26.656Z
|
General Question
|
v2
|
can you set a character array to NULL?
| null | null | null |
63c648125f004bf4898cf932
|
2023-03-17T16:12:21.803Z
|
General Question
|
v2
|
how to write ineteger to a binary file?
| null | null | null |
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