// -----------------------------------------------------------------------
// Abstract Creature
// Demonstrates abstract classes
// -----------------------------------------------------------------------
#include <iostream>
using namespace std;

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
class Creature //abstract class
{
   public:
      Creature(int health = 100);
      virtual void Greet() const = 0; //pure virtual member function
      virtual void DisplayHealth() const;
   protected:
      int m_Health;
};

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
Creature::Creature(int health): m_Health(health)
{
   // nothing else to do
}

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
void Creature::DisplayHealth() const
{
   cout << "Health: " << m_Health << endl;
}


// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
class Orc : public Creature
{
   public:
      Orc(int health = 120);
      virtual void Greet() const;
};

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
Orc::Orc(int health): Creature(health)
{
   // nothing else to do
}

// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
void Orc::Greet() const
{
   cout << "With a grunt the orc says hello.\n";
}


// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
// main - it all begins here
// -----------------------------------------------------------------------
int main()
{
   Creature* pCreature = new Orc();
   pCreature->Greet();
   pCreature->DisplayHealth();
   return 0;
}