If we make the entire class as a friend the automatically all the member functions of the class become friends.

For class B to be a friend of class A. The class A must explicitly declare class B is its friend in the public section

Simple Program for Friend Class

using namespace std;
class Distance
int meter;
Distance(): meter(0) { }
//friend function
friend int addFive(Distance);
// friend function definition
int addFive(Distance d)
//accessing private data from non-member function
d.meter += 5;
return d.meter;
int main()
Distance D;
cout<<"Distance: "<< addFive(D);
return 0;

Output:-The value of a in sample2 class :5

Explanation of the program

Here sample1 and sample2 are 2 classes and sample2 is a friend of sample1. Hence, sample2 can access all the private data members and member functions of the sample1 class.

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