Using macro results in incorrect output when used as part of a larger math expression - why does this happen?

Question

This is a normal C routine program which i found out in some question bank. It is shown below:

#define CUBE(p) p*p*p

main()
{
    int k;
    k = 27 / CUBE(3         


        

Answer 1

k=27/CUBE(3);  =>   k=27/3 * 3 * 3;

Do you see it? CUBE should be defined like this instead:

#define CUBE(p) ((p)*(p)*(p))