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

#define triple(n)    ((n) * 3)  // fixed by also wrapping each parameter in parentheses

#define  print_int_expression(n, description)  ( printf("\n// %s\n// Line %d in %s\n// Compiled at %s\n%s == %d\n", (description), __LINE__, __FILE__, __TIME__, (#n), (n)) )
// ∙ #n  will be replaced by a string constant of whatever was passed in for that parameter.
// ∙  n  will be replaced by the value         of whatever was passed in for that parameter.
// ∙ Parethesizing the replacement is probably not necessary since we don't normally use printf in an expression.

int main(int argc, char* argv[]) {
    printf("triple(100) == %d\n", triple(100));
    printf("triple(100 + 100) == %d\n", triple(100 + 100));

    print_int_expression(triple(100 + 100 + 100), "three times one hundred");
    // Preprocessor replaces ↑ with this ↓.
    // ( printf("%s == %d\n", ("triple(100 + 100 + 100)"), (((100 + 100 + 100) * 3))) );

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

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