21. Predict the output or error(s) of the following c code

1
2
3
4
5
6
7

#define square(x) x*x
main()
{
	int i;
	i = 64/square(4);
	printf("%d",i);
}

Answer:
64

Explanation:
the macro call square(4) will substituted by 4*4 so the expression becomes i = 64/4*4 . Since / and * has equal priority the expression will be evaluated as (64/4)*4 i.e. 16*4 = 64