Introduction

• Polymorphism
  • "Program in the general"
  • Treat objects in same class hierarchy as if all base class
  • Virtual functions and dynamic binding; will explain how polymorphism works
  • Makes programs extensible; new classes added easily, can still be processed
• In our examples
  • Use abstract base class Shape
    • Defines common interface (functionality)
    • Point, Circle and Cylinder inherit from Shape
  • Class Employee for a natural example