GreeterVirtual.cpp

class GenericGreeter {
 public:
  virtual void Greet(const char* name) {
    cout << "Hi " << name << "." << endl;
  }
};

class FriendlyGreeter : public GenericGreeter {
 public:
  virtual void Greet(const char* name) {
    cout << "Hello " << name << "! It's a pleasure to meet you!" << endl;
  }
};