Friend Function

Program To Illustrate The Concept Of Friend Function:

#include<iostream>
using namespace std;
class test;
class sample
{
    int x;
    public:
        sample()
        {
            cout<<"\nEnter The Value Of X ";
            cin>>x;
        }
        friend void max(sample &a,test &b);
};
class test
{
    int y;
    public:
        test()
        {
            cout<<"\nEnter The Value Of Y ";
            cin>>y;
        }
        friend void max(sample &a,test &b);
};
void max(sample &a,test &b)
{
    if(a.x>b.y)
    {
        cout<<a.x<<" is Greater Than "<<b.y;
    }
    else
    {
        cout<<b.y<<" is Greater Than "<<a.x;
    }
}
main()
{
    sample c;
    test d;
    max(c,d);
}