A program to explain NESTED MACROS

#include <stdio.h>
#define square(x) (x * x)
#define cube(y) (y * y * y)
#define sixth(z) (square(cube(z)))
 
void main()
{
    int side;
    int a;
    float area, b;
 
    printf("Enter values: ");
    scanf("%d %d", &a, &side);
    area = square(a);
    b = sixth(side);
 
    printf("\n%f\n%f", area, b);
    printf("\n");
}