1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | #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%s == %d\n", (description), (#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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