#include<iostream>

class A {
public:
  void f() {
    std::cout << "A::f" << std::endl;
  }
  virtual void g() {
    std::cout << "A::g" << std::endl;
  }
};

class B : public A {
public:
  void f() {
    std::cout << "B::f" << std::endl;
  }
  virtual void g() {
    std::cout << "B::g" << std::endl;
  }
};

int main(int argc, char** argv) {
  A a;
  B b;
  A* aPtr = &a;
  A* bPtr = &b;
  aPtr->f();
  aPtr->g();
  bPtr->f();
  bPtr->g();
  return 0;
}