EXIT_SUCCESS, EXIT_FAILURE

The EXIT_SUCCESS and EXIT_FAILURE macros expand into integral constant expressions that can be used as arguments to the exit function (and, therefore, as the values to return from the main function

Notes

Both EXIT_SUCCESS and the value zero indicate successful program execution status (see exit), although it is not required that EXIT_SUCCESS

Example

#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
    FILE* fp = fopen("data.txt", "r");
    if (fp == NULL)
    {
       fprintf(stderr, "fopen() failed in file %s at line #%d", __FILE__, __LINE__);
       exit(EXIT_FAILURE);
    }
 
    /* Normal processing continues here. */
    fclose(fp);
    printf("Normal Return\n");
 
    return EXIT_SUCCESS;
}

fopen() failed in file main.cpp at line #9

References

See also