Friend Function Program in C Plus Plus

                              Friend Function Program in C Plus Plus

      

The friend Function is such a type of function which is not the part of any class but it can access the public, protected and private data of the classes of which it is friend.

We use only the friend keyword before the function to which we are willing to make friend. Secondly all the classes which are friends of this function must be declared before the first friend class definition.

                                                                    Scenario

 

We will declare the two classes A and B and make a friend function show() preceding with keyword friend. This function will access the data of both classes and perform calculation on data and give the output to user.

So Let’s start our work.

                                                           Program in C++ of Friend Function

Code

#include<iostream>

using namespace std;

class B;

class A{

            private:

                        int a;

            public:

                        A()

                        {

                                    a=10;

                        }

                        friend void show(A,B);

};

class B{

            private:

                        int b;

            public:

                        B()

                        {

                                    b=10;

                        }

                        friend void show(A,B);

};

void show(A x,B y)

 {

            int c=x.a+y.b;

            cout<<"C ======= "<<c<<endl;

 }

 int main()

 {

            A a;

            B b;

            show(a,b);

           

 }

                                        Program in C++ of Friend Function

Output

 

Below is the .exe file run of the above code on Dev C++ IDE.

 

As you can see that we have successfully add the data of both classes in a friend function and display the result in another variable.

That’s it.

 

 

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