#include<stdio.h>

void foo(int a, int *b, int &c, int *& d){
	a = 40;
	*b = 50;
	c = 60;
	d = b;
}

int main(){
	int x = 3, y = 7, z = 10, w = 12;
	int *wp = &w;
	foo(x, &y, z, wp);

	printf("x = %d, y = %d, z = %d, w = %d\n", x, y, z, w);	
	*wp = 17;
	printf("x = %d, y = %d, z = %d, w = %d\n", x, y, z, w);	

	return 0;
}