What is re usability in c plus plus?

Answer 1

Code reusability can be found in every programming language, it is not a feature that is specific to C++. However, object oriented languages such as C++ give us much better opportunities for code reusability through inheritance. That is, a derived class inherits the public and protected members of its base classes, so we can make use of existing code to provide more specialised implementations. We don't have to continually re-invent wheels to implement base class functionality that already exists. Moreover, shared class libraries allow us to re-use code in more than one application.