//yy.cpp
#include <iostream.h>
class Animal {
   public:
   Animal( ) { cout << "A "; }
  virtual 
      void talk( ){   cout << "haha "; }
};
class Dog : public Animal {
   public:
     Dog( ) { cout << "D "; }
     void talk( ) {  cout << "Won won "; }
};
class Cat: public Animal {
   public:  void talk( ) { cout << "Miao "; }
   Cat( ) { cout << "C "; }
   ~Cat( ) { cout << "C-dead "; }
};
Dog a;
int main( ) {
    Cat b;
     a.talk( );  b.talk( );
    Animal * p;
    p = new Dog( );
    p-> talk( );   p= new Cat( );  p-> talk( );
    return 0;
}