Can anyone explain why this code not running

Question

#include <stdio.h>
#define THIS
#define THAT
int main() {
#if THIS && THAT
printf("I love beer");
#else
printf("I love chicken");
#endif
return 0;
}

Answer 1

I think you'll want

#if defined(THIS) && defined(THAT)

or

#ifdef THIS
#ifdef THAT

Answer 2

Thanks Schindlabua this worked
#include <stdio.h>
#define THIS
#define THAT
int main() {
#ifdef THIS && THAT
printf("I love beer");
#else
printf("I love chicken");
#endif
return 0;
}

Answer 3

~ swim ~ can you help me in this