Explain the terms- substitutability and extensibility, C/C++ Programming

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Explain the terms- Substitutability and Extensibility

Substitutability - The objects of a properly derived class can be safely and easily substituted for an object of its base class.

Extensibility - Properly derived class can be safely and freely used in place of its base class even if properly derived class is created a lot later than defining user code. Extending functionalities of a system is a lot easier when you add a properly derived class comprising enhanced functionalities.

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