Inheritance is one of the most useful and essential characteristics of object-oriented programming. The existing
classes are main components of inheritance. The new classes are created from existing one. The properties of
existing classes are simply extended to the new classes. The new classes created using such methods are known
as derived classes and the existing classes are known as base classes as shown in Figure 18.1. The relationship
between the base and derived class is known as kind of relationship. The programmer can define new member
variables and functions in the derived class. The base class remains unchanged. ...
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