#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)) )
// Preprocessor directives normally need to be on one line.
// You can continue onto additional lines by adding a backslash ('\') at the end of the previous line.
// Do not add a backslash at the end of the last line.

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: */