Friend Class Example Code from Classroom

#include<iostream.h>

#include<conio.h>

 

class beta;

 

class alpha

{

private:

int d;

public:

alpha()

{

    d = 9;

}

void display_beta(beta b);

friend beta;

};

 

class beta

{

private:

int d1;

 

public:

beta()

{

d1 = 10;

}

void display_alpha(alpha a)

{

cout << "\n Data in alpha object a is " << a.d;

}

void square_alpha_data(alpha a)

{

int sq = a.d * a.d;

cout << "\nSquare is : " << sq;

}

friend alpha;

};

 

 

void alpha :: display_beta(beta b)

{

cout << "\n Data in alpha object a is " << b.d1;

}

 

 

int main(void)

{

alpha a;

beta b;

 

clrscr();

a.display_beta(b);

b.display_alpha(a);

b.square_alpha_data(a);

 

getch();

return 0;

}