// Question 5:  (8 points)  What does the following program print out?
#include<stdio.h>

int foo(int *x, int y){
	int z = *x;
	*x = y;
	y = z;
	return z + *x;
}

int main(){
	int x = 10, y = 20;
	printf("%d\n", foo(&y, x));
	printf("x = %d, y = %d\n", x, y);
	return 0;
}