Write a program that will demonstrate friendly function

Write a program that will demonstrate friendly function. The program that uses the following properties – two class names- getcn, getdn. getcn class contain one integer type private member variables- c, public member function get_val(int e). getdn class contain one integer type private member variables- d, public member function get_val(int e). Both class contains friend function - friend void add(getcn x, getdn y). get_val(int e) function get the value of e from main function. Friend function add(getcn x, getdn y) will add both c and d values and display the addition result as output.

#include<iostream>

using namespace std;

class getdn;

class getcn

{

    int c;

public:

    int get_val(int e){c=e;}

    friend void add(getcn,getdn);

};

class getdn

{

    int d;

public:

    int get_val(int e){d=e;}

    friend void add(getcn,getdn);

};

void add(getcn x,getdn y)

    {

        cout<<"Addition is : "<<x.c+y.d<<endl;

    }

 int main()

 {

     getcn obj1;

     obj1.get_val(10);

     getdn obj2;

     obj2.get_val(10);

     add(obj1,obj2);

     return 0;

 }