#include <iostream.h>

class B 
{  public:
      B(int i) : x(i) {}
   protected:
      int x;
};

class D : public B
{  public:
     D(int i, int j) : B(i), y(j) {}
     void mtry(D& obj)
     {   cout << obj.x;
     }
     void ntry(B& obj)
     {   cout << obj.x;      // no access
     }
   private:
     int y;
};

int main()
{   D u(3,4);
    D v(9,17);
    B w(78);
    u.mtry(v);
    u.ntry(w);
    return(0);
}