C++ 练习(4)

#include 

#define DFUN1(a) ((a)*(a)*(a))
#define DFUN2(a) (a)*(a)*(a)
#define DFUN3(a) (a*a*a)
#define DFUN4(a) a*a*a

using namespace std;

int main()
{
    long x=2, y=3, a, b, c, d;
    
    a = DFUN1(x);
    b = DFUN2(x);
    c = DFUN3(x);
    d = DFUN3(x);
    cout