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Program to implement the friend function.

 

#include<iostream.h>
#include<conio.h>

class B;

class A
{
private:
int a;
public:
void geta()
{
cout<<"enter a:";
cin>>a;
}
friend void add(A x, B y);
};


class B
{
private:
int b;
public:
void getb()
{
cout<<"enter b:";
cin>>b;
}
friend void add(A x, B y);
};


void add(A x,B y)
{
cout<<"sum is:"<<x.a+y.b;
}

void main()
{
A x;
B y;
x.geta();
y.getb();
add(x,y);
getch();
}

Output:

enter a:10
enter b:20
sum is:30
 

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