FRIEND FUNCTION IN C++

 #include<iostream>

using namespace std;

class cl

{

int a;

public:

void input(int x)

{

a=x;

}

void output()

{

cout<<a<<endl;

}

friend void f(cl ); // the function f() is a friend function , which can access the private member of class cl.

};

// The functiin f is not a member function of f(cl ) . For this reason no scope resolution operator is used .

void f(cl ob)

{

cout<<ob.a<<endl; // ob.a is a private member of class cl.

}

int main ()

{

cl ob;

cout<<"sunday"<<endl;

ob.input(100);

cout<<"monday"<<endl;

ob.output();

cout<<"friday"<<endl;

f(ob);

}