Virtual, Friend and Static Function

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What is Virtual Function? How can you access this function using pointer? Explain with example.

Virtual means existing in appearance but not in reality. Polymorphism refers to the property by which objects belonging are able to respond to the same message, but in different forms.

When we use the same function name in both the classes, the function in the base class is declared as virtual using the keyword virtual preceding it's normal declaration. C++ requires pointers to objects to use the virtual function.

Example :-

#include<iostream>