Friend function in C++ with Programming example

Friend function in C++ with Programming example

In this tutorial, we will Learn:

What is friend function in C++ with Programming example?

Explain how one can bridge two classes using the friend function. Write a C++ program to find the sum of two numbers using bridge function add()

Solution:

Video Tutorial:

A class can have global non-member functions and member functions of other classes as friends.

The friend function is a function that is not a member function of the class but it can access the private and protected members of the class.

The friend function is given by a keyword friend.

These are special functions which are declared anywhere in the class but have given special permission to access the private members of the class.

Following program demonstrates the C++ program to find the sum of two numbers using bridge function add().

 #include<iostream>
 using namespace std;

 class addtwonumbers
 {
     int x, y;
     public:
         addtwonumbers()
         {
             x = 0;
             y = 0;
         }
         addtwonumbers(int a, int b)
         {
             x = a;
             y = b;
         }
         friend int add(addtwonumbers &obj);
 };

 int add(addtwonumbers &obj)
 {
     return (obj.x+ obj.y);
 }

 int main()
 {
     addtwonumbers a1;
     cout<<"Sum is: "<<add(a1)<<endl;
     addtwonumbers a2(10, 20); 
     cout<<"Sum is: "<<add(a2)<<endl;
 }

OUTPUT:

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Sum is: 0

Sum is: 30

Summary:

In this article, we understood the concept of the Friend Functions in C++ with a simple Programming example and wrote a C++ program to find the sum of two numbers using friend function add().

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