Modify Exercise 1 so draw ( ) is a pure virtual function. Try creating an object of type Shape….

Modify Exercise 1 so draw ( ) is a pure virtual function. Try creating an object of type Shape. Try to call the pure virtual function inside the constructor and see what happens. Leaving it as a pure virtual, give draw ( ) a definition.

Exercise 1

Create a simple “shape” hierarchy: a base class called Shape and derived classes called Circle, Square, and Triangle. In the base class, make a virtual function called draw ( ), and override this in the derived classes. Make an array of pointers to Shape objects that you create on the heap (and thus perform upcasting of the pointers), and call draw ( ) through the base-class pointers, to verify the behave or of the virtual function. If your debugger supports it, single-step through the code.

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