#include <iostream>
    #include <typeinfo>
    using namespace std;

    class  Base {
  public:
    void f() {
    std::cout << 2 << " ";
  }
  virtual void g() {
    std::cout << 7 << " ";
  }
};


class Derived:public Base {
  public:
      void f() {
    std::cout << 1 << " ";
  }
  void g() {
    std::cout << 3 << " ";
  }
  virtual void h() {
    std::cout << 4 << " ";
  }
};


class Young:public Derived {
  public:
      void h() {
    std::cout << 9 << " ";
  }
};



   int main() {
      Base *a;
      Derived b;
      Base *c = new Base;
      Base *d = new Derived;
      Derived *e = new Derived;
      Base *u = new Young;

      cout << (static_cast<Derived*>(c)==nullptr) << " ";
    cout << (dynamic_cast<Derived*>(c)==nullptr) << " ";
  cout << (static_cast<Derived*>(d)==nullptr) << " ";
  cout << (dynamic_cast<Derived*>(d)==nullptr) << " ";
  cout << (static_cast<Derived*>(u)==nullptr) << " ";
  cout << (dynamic_cast<Derived*>(u)==nullptr) << " " << endl;
  cout << (typeid(*u)==typeid(Base)) << " ";
    cout << (typeid(*u)==typeid(Derived)) << " ";
  cout << (typeid(*u)==typeid(Young)) << " " << endl;
return 0;

}