#include <iostream> 
using namespace std; 
template <class T> 
T swap(T&a,T&b) 
{ 
    T temp; 
    temp=a; 
    a=b; 
    b=temp; 
} 
int main() 
{ 
    int x,y;
    x=10; 
    y=20; 
    cout<<"\n Before Swap : "<<x<<"  "<<y; 
    swap(x,y); 
    cout<<"\n After Swap : "<<x<<"  "<<y; 
    return 0; 
}