#include <iostream>
using namespace std;
template<class T>
void swap(T *a,T *b)
{
    T t;
    t=*a;
    *a=*b;
    *b=t;
}
int main()
{
    int x=10,y=20;
    cout<<"Before swapping :"<<x <<y;
    swap(&x,&y);
    cout<<"\nAfter swapping :"<<x <<y;
    return 0;
}