10.A program to demonstrate how a pure virtual function is defined, declared and invoked from the object of a derived class through the pointer of the base class.
11.A program to illustrate how to declare a pure virtual function and equate it to zero as it does not have any function parts.
12.A program to demonstrate how to define an abstract base class with pure virtual functions in which the function definition part has been defined without any statement. The members of the derived class objects are accessed through the base class objects through pointer technique.
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