Is this related to booleans?

Question

#include <iostream>
using namespace std;
#define h(x)(x||0)
int main() {
cout<<h(1);
return 0;
}

I read somewhere that 1 is taken as true and 0 as false

Answer 1

True at Norbivar
and one more thing
"null is false"

Answer 2

0 and 1 was related to boolean.
Yes right generous! :V

Answer 3

Actually : 0 is false, and EVERYTHING ELSE is true.