EXAMPLE FOR FRIEND FUNCTION IN C++

#include<iostream>
using namespace std;
class sample
{
    int a,b;
public:
    void getdata()
    {
        cout<<"Enter the value of a and b"<<endl;
        cin>>a>>b;
    }
    friend int mean(sample s)
    {
        int m=(s.a+s.b)/2;
        return m;
    }
};
int main()
{
    sample s;
    s.getdata();
    cout<<" mean = "<<mean(s);
return 0;
}