#include <iostream.h>

void Swap(int& x,int& y);

int main(void)
{
       int n1 = 1, n2 = 2;
       Swap(n1,n2);
       cout << n1 << "  " << n2 << endl;
}

void Swap(int& x,int& y)
{
       int t = x;      x = y;  y = t;
}
