Виртуальные функции - C++

#include "stdafx.h"
#include <stdio.h>
 
class Word
{
public:
  virtual void  word_main (char *x) { printf("I know word %s\n", x); }
};
 
class Word2 : public Word
{
public:
  virtual void  word_main (char *x) { printf("I know second word %s\n", x); }
};
 
class Word3 : public Word
{
public:
  virtual void  word_main (char *x) { printf("I know thid word %s\n", x); }
};
 
 
int _tmain(int argc, _TCHAR* argv[])
{
    Word2*  pointer2      = new Word2 ();
    Word3*  pointer3      = new Word3 ();
    Word*    pointer_copy1 = pointer2;
    Word*    pointer_copy2 = pointer3;
    Word*    pointer1 = new Word();
 
    pointer2->word_main ("asd");
 
    pointer_copy1->word_main ("qwe");
    pointer_copy2->word_main ("asd");
    pointer1->word_main("asd");
    return 0;
}