#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

#define MSG_YO    "Yo"
// Preprocessor will replace every instance of MSG_YO with "Yo".

#define NUMBER_5  5
// Preprocessor will replace every instance of NUMBER_5 with 5.

int main(int argc, char* argv[]) {
    printf("MSG_YO == %s\n", MSG_YO);

    printf("NUMBER_5 == %d\n", NUMBER_5);
    
    return EXIT_SUCCESS;
    // EXIT_SUCCESS is a symbol that was created using a #define directive in the stdlib.h standard
    // header.  The directive was as follows:
    //     #define  EXIT_SUCCESS  0
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */