#include
using namespace std;
void swap(int &x, int &y);
int main(){
int x = 5, y = 10;
cout << "Main. Before swap, x: " << x << " y: "
<< y << endl;
swap(x,y);
cout << "Main. After swap, x: " << x << " y: "
<< y << endl;
return 0;
}
void swap (int &rx, int &ry){
int temp;
cout << "Swap. Before swap, rx: " << rx << " ry: " << ry << endl;
temp = rx;
rx = ry;
ry = temp;
cout << "Swap. After swap, rx: " << rx << " ry: " << ry << endl;
}