1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
// // BUG
// #define TRIPLE(n) (n * 3)
// FIXED by parenthesizing each parameter in the replacement string.
#define TRIPLE(n) ((n) * 3)
int main(int argc, char* argv[]) {
printf("TRIPLE(100) == %d\n", TRIPLE(100));
printf("TRIPLE(100 + 100) == %d\n", TRIPLE(100 + 100));
// Preprocessor will replace TRIPLE(100 + 100) with ((100 + 100) * 3).
// Statement will become:
// printf("TRIPLE(100 + 100) == %d\n", ((100 + 100) * 3));
// Expect: 600
// Actual: 600
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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