Why can't I use EXIT_SUCCESS instead of 0 in the return statement in Visual Studio Code?

Question

Why can't I use EXIT_SUCCESS instead of 0 in the return statement in Visual Studio Code? I get the error:

id "EXIT_SUCCESS" is not defined

#include <stdio.h>

int main(void)
{
    puts("Thanks for help");
    return EXIT_SUCCESS; /*problem*/
}

Answer 1

The definitions of the EXIT_SUCCESS and EXIT_FAILURE macros are in the "stdlib.h" header file, so you need to #include <stdlib.h> in order to use them.

(Some compilers may implicitly include that header when you include "stdio.h" but you can't rely on that behaviour.)