M_N_2.cpp

#include <iostream>
using namespace std;

class N;
class M {
    private:
      int x;
    public:
      M()
        {
            x=10;
        }
      friend int div(M, N);
};

class N {
    private:
       int y;
    public:
       N()
        {
            y=2;
        }
       friend int div(M , N);
};

int div(M objectA, N objectB)
{
   return (objectA.x / objectB.y);
}

int main()
{
    M objectA;
    N objectB;
    cout<<"Div: "<< div(objectA, objectB);
    return 0;
}

========================output==========================
Div: 5