Printing basic example using friend function in C++

This is a C++ program that demonstrates the use of friend functions to access private data members of two different classes, A and B.

The program defines two classes, A and B, each with a private integer data member (x and y, respectively) and a public member function (setdata) to set the value of the data member.

The program also defines a friend function min, which takes objects of classes A and B as its arguments and compares their private data members (x and y, respectively) to find and print the minimum value.

In the main function, the program creates objects of classes A and B, sets their data members to values 10 and 20, respectively, and calls the min function, passing the objects as arguments. The min function then compares the data members of the objects and prints the minimum value (in this case, 10).

Source Code

#include<iostream>
using namespace std;
class B;
class A
{
   int x;
   public:
   void setdata(int i)
   {
       x=i;
   }
   friend void min(A,B);
};
class B
{
   int y;
   public:
   void setdata(int i)
   {
    y=i;
   }
   friend void min(A,B);
};
void min(A a,B b)
{
   if(a.x<=b.y)
   std::cout<<a.x<<std::endl;
   else
   std::cout<<b.y<<std::endl;
}
int main()
{
   A a;
   B b;
   a.setdata(10);
   b.setdata(20);
   min(a,b);
   return 0;
}

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