#include <iostream>
using namespace std;

class TBase
{
  public:
     virtual Show() { cout << "Base class\n"; };
};

class TDerived : public TBase
{
  public:
     virtual Show() { cout << "Derived class\n"; };
};


int main(void){
	TBase Base;
	TDerived Derived;
	TBase *BasePtr;

	Base.Show();  
	Derived.Show(); 

	BasePtr = &Base;
	BasePtr->Show();

	BasePtr = &Derived;
	BasePtr->Show();
}