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what do u mean by abstract classes and pure virtual functions?
please send me the details

Abstract Class & Pure Virtual function are related to each other and is one of the important features of C++ Programing language.

An abstract class is a class that is designed to be specifically used as a A pure virtual function is a virtual function that is required to be implemented by a derived class if the derived class is not abstract.

Classes containing pure virtual methods are termed "abstract" and they cannot be instantiated directly.