#include <iostream>
class A { 
private: 
    int a; 
  
public: 
    A() { a = 0; } 
    friend class B; // Friend Class 
}; 
  
class B { 
private: 
    int b; 
  
public: 
    void showA(A& x) 
    { 
         
        std::cout << ""A::a="" << x.a; 
    } 
}; 
  
int main() 
{ 
    A a; 
    B b; 
    b.showA(a); 
  
 }