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:
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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