6) Write a C++ program on private Constructor.

 source file name: privateconst.cpp

// CPP program to demonstrate usage of private constructor

#include <iostream.h>

//using namespace std;

// class A

class A{

private:

A(){

cout << "constructor of A\n";

}

friend class B;

};

// class B, friend of class A

class B{

public:

B(){

A a1;

cout << "constructor of B\n";

}

};

// Driver program

int main(){

B b1;

return 0;

}

output: