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9.18.derived class
9.18.1.Add a constructor to derived class
9.18.2.Call base's constructor and destructor from derived class
9.18.3.Access member of base and use member of derived class
9.18.4.Overriding a base class method in a derived class
9.18.5.Hiding methods
9.18.6.Calling base method from overridden method.
9.18.7.Using virtual methods
9.18.8.Inherit base class twice
9.18.9.dynamic_cast: Cast from Derived * to Base *