Header file:
assert.h
Synopsis:
void assert(int expr);
Description:
It aborts the program if the expr is false.
Sample program for assert in C:
#include<stdio.h>
#include<assert.h>
#include<errno.h>
int main() {
FILE *fp;
fp = fopen("jp.txt", "r");
if (fp == NULL) {
assert(fp);
}
printf("File opened in read mode\n");
fclose(fp);
return 0;
}
#include<assert.h>
#include<errno.h>
int main() {
FILE *fp;
fp = fopen("jp.txt", "r");
if (fp == NULL) {
assert(fp);
}
printf("File opened in read mode\n");
fclose(fp);
return 0;
}
Output:
jp@jp-VirtualBox:~/cpgms/assert$ ./a.out
a.out: assert.c:8: main: Assertion `fp' failed.
Aborted
jp@jp-VirtualBox:~/cpgms/assert$ ls
a.out assert.c
a.out: assert.c:8: main: Assertion `fp' failed.
Aborted
jp@jp-VirtualBox:~/cpgms/assert$ ls
a.out assert.c
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