Friend function

                Friend function is used to access private data members of the class. Friend is not a member function but it is declared in the class and defined outside the class. For friend class click on the link.

#include<conio.h>

#include<iostream>

using namespace std;

class avg

{

                private:

                        float a,b;

                public:

                                avg(){a=0.0,b=0.0;}

                                void get()

                                {

                                                cout<<"\n enter the value of a and b: ";

                                                cin>>a>>b;

                                }

                                friend float avrg(avg x); //friend function declaration.

};

float avrg(avg x) // friend definition.

{

                return (x.a+x.b)/2;

}

int main()

{

                avg A;

                A.get();

                cout<<"\n the average value of these two numbers is :"<<avrg(A);

                getch();

                return 0;

}