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Why pure virtual functions are used and when does a pure virtual function become useful?

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Why pure virtual functions are used and when does a pure virtual function become useful?
posted Mar 4, 2016 by Mohammed Hussain

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1 Answer

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Briefly, it's to make the class abstract, so that it can't be instantiated, but a child class can override the pure virtual functions to form a concrete class. This is a good way to define an interface in C++.

for example:

if you have a class named SHAPE(where you can derived different types of shapes circle/square/triangle...)
And suppose SHAPE has function to calculate AREA. but you can't define AREA for every type of shape. That s why it is not implemented in the base class.

answer Mar 7, 2016 by Manikandan J
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