#include<iostream>
using namespace std;

template<class U>
class square
{
    U x;
    U y[5];
public:
    square()
    {
        cout<<"Enter xn";
        cin>>x;
        cout<<"Enter array valuesn";
        for(int i=0;i<5;i++)
        {
            cin>>y[i];
        }
    }
    void display()
    {
        cout<<endl<<"x="<<x<<endl;
        cout<<"array valuesn";
        for(int i=0;i<5;i++)
        {
            cout<<" "<<y[i];
        }
    }

};

template<class T>
void swap(T &a,T &b)
{

    T temp;
    temp=a;
    a=b;
    b=temp;

}

main()
{
    square<int>A;
    square<int>B;

    cout<<"nBefore swapn";
    A.display();
    B.display();
    swap<square>(A,B);  // This shows error....why ?
    cout<<"nAfter swapn";
    A.display();
    B.display();
}