#include<iostream>
using namespace std;

// Works in C
// In this version, we pass an address
void swap(int *a, int *b){
	int t = *a;
	*a = *b;
	*b = t;
}

// Does not work in C
// This is pass by reference
void swap_cpp_only(int &a, int &b){
	int t = a;
	a = b;
	b = t;
}

int main(){
	int x = 24, y = 425;

	cout << "x = " << x << endl;
	cout << "y = " << y << endl;

	swap(x, y);
	cout << "After swap:  " << endl;
	cout << "x = " << x << endl;
	cout << "y = " << y << endl;
	return 0;
}