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What is Friend class ?

When the function is declared as a friend, then it can access the private and protected data members of the class.This is needed when we want to allow a particular class to access the private and protected members of a class.

Q1.) Example of Friends Class .
    #include < iostream>  
using namespace std;  
class A  
    int x =5;  
    friend class B;           // friend class.  
class B  
    void display(A &a)  
        cout<<"value of x is : "<< a.x;  
int main()  
    A a;  
    B b;  
    return 0;  
value of x is : 5