class C {
public: virtual void f (int x) { h (x); cout << "C::f," << x << endl; }
             virtual void g ()      { h (0); cout << "C::g"       << endl; }
             virtual void h ()      {        cout << "C::h"       << endl; }
             virtual void h (int k) { h ();  cout << "C::h," << k << endl; }
};
class D: public C {
public: virtual void f (int y) { h (y); cout << "D::f," << y << endl; }
             virtual void g ()      { h (1); cout << "D::g"       << endl; }
             virtual void h ()      {        cout << "D::h"       << endl; }
             virtual void h (int k) { h ();  cout << "D::h," << k << endl; }
};
int main( ){ C c; D d; C * p = & d;
p -> f (2);  p -> g ();  p -> h ();  p -> h (3);  }