Suppose class two is derived from class one. To avoid multiple inclusion of these classes, which preprocessor directives are used in the header files containing the definitions of these classes. Justify your answer by giving an example.

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OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career. 

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is: