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#include <iostream>

class Base
{
public:
  Base() { std::cout << "Base constructor\n" << std::endl; }
  ~Base() { std::cout << "Base destructor\n" << std::endl; }
};

class Derive : public Base
{
public:
  Derive() { std::cout << "Derive contructor\n" << std::endl; }
  virtual ~Derive() { std::cout << "Derive destructor\n" << std::endl; }
};

int main()
{
  Base * ptr = new Derive;
  delete ptr;
  return 0;
}