#include <iostream>

class A{
  public:
  void one(){ std::cout << "A::one" << std::endl; }
  void two(){ std::cout << "A::two" << std::endl; }
  virtual void three() { std::cout << "A::three" << std::endl; }
  virtual void four() { std::cout << "A::four" << std::endl; }
};

class B : public A{
  public:
  void one() { std::cout << "B::one" << std::endl; }
  int one(int a) { std::cout << "B::one" << std::endl; }

  virtual void three() { std::cout << "B::three" << std::endl; }
};

int main(){
  A a;
  B b;

  A *ap = new A();
  A *apb = new B();

  B *bp = new B();


  a.one();
  a.two();
  a.three();
  a.four();

  b.one();
  b.two();
  b.three();
  b.four();

  ap->one();
  ap->two();
  ap->three();
  ap->four();

  apb->one();
  apb->two();
  apb->three();
  apb->four();

  bp->one();
  bp->two();
  bp->three();
  bp->four();


  return 0;
}