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

// A "macro" is a #define that takes ≥1 parameter.
//
// It works using a simple // text replacement.  Macros do
// not have a call stack of their own, as functions do.
// They happen before compilation or anything else.

#define TRIPLE(x) ((x) * 3)

#define ADD_5(x)  ((x) + 5)

// Rules for #define macros
// 1) Parenthesize each parameter in the definition.
// 2) Parenthesize entire experssion in the definition.

int main(int argc, char* argv[]) {

    printf("TRIPLE(5) ====== %d\n", TRIPLE(5));

    printf("TRIPLE(5 + 3) == %d\n", TRIPLE(5 + 3));
    
    return EXIT_SUCCESS;
}
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