1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #include <stdio.h>
#include <stdlib.h>
// Enable log_int only when LECTURE_DEBUG symbol is defined, either through
// a #define or through a GCC flag.
#ifdef LECTURE_DEBUG
# define log_int(x) printf("%s == %d\n", (#x), (x))
#else
# define log_int(x)
#endif
// In the macro above, the «#x» argument to printf(…) is expanded to
// the text of the argument passed to log_int. For example, when calling
// log_int(triple(5)), (#x) will be expanded to "triple(5)", while (x) is
// expanded to the function call triple(5), which evaluates to the value 15.
int triple(int n) {
return n * 3;
}
int main(int argc, char* argv[]) {
log_int(triple(5));
log_int(triple(4));
log_int(triple(3));
log_int(triple(2));
log_int(triple(1));
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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