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7.23.1.Virtual Methods and Overriding
7.23.2.Override virtual functions virtual method
7.23.4.Override virtual method
7.23.5.Define virtual function in base and its subclass
7.23.6.Class inheritance with virtual method
7.23.7.Illustrates versioning: virtual/new
7.23.8.Illustrates polymorphism
7.23.9.Demonstrate a virtual method.

7.23.10.When a virtual method is not overridden, the base class method is used
7.23.11.Virtual method in a multilevel hierarchy
7.23.12.Use virtual methods and polymorphism.
7.23.13.Virtual Accessor