Purposes of this assignment: Writing a set of C++ classes and structures with inheritance and polymorphism Designing and implementing structures and classes of multiple shapes with their inheritance relationship Pure virtual functions and polymorphism Refactoring the codes written in functions in a file to a set of shapes with inheritances in multiple *.cpp and *.h files. Understanding and experiencing the benefit of OOP Instructions OOP Motivation: Why OOP? Why classes? In PA 4 Part2, you implemented draw() function using a switch statement to draw multiple shapes. In addition to draw() function, you also did very similar coding to compute areas and circumferences of those 4 shapes. Thinking back, you would realize that each function (drawing, computing areas, or computing circumferences) implemented the same functionality for all different shapes using a switch statement (or if-statements) to differentiate each shape. This poses some major issues developing and maintaining your program to point out a few of them :