#include <stdio.h>

void multiply(int a, int b, int *c);

int main(void)
{
        int x,y,z;

	x = 3;
	y = 4;
 
        printf("\t   x\t   y\t   z\n\n");
	
	multiply(x, y, &z);
	printf("\t%4d\t%4d\t%4d\n",x, y, z);

	multiply(y, x, &z);
	printf("\t%4d\t%4d\t%4d\n",x, y, z);

	multiply(z, y, &x);
	printf("\t%4d\t%4d\t%4d\n",x, y, z);

	multiply(z, z, &x);
	printf("\t%4d\t%4d\t%4d\n",x, y, z);

	multiply(y, y, &y);
	printf("\t%4d\t%4d\t%4d\n",x, y, z);

	return 0;
}

void multiply(int a, int b, int *c)
{
   *c = a * b;
}