4.	(15 points) We discussed three characteristics that define Object-Oriented Programming.  Name and give a brief definition of each.

•	Encapsulation- data hiding as much as possible, internal working and structure of the object are hidden for reliability.
•	Inheritance- create a base class, create derived class that inherits data members and/or function members.
•	Polymorphism Recursive types- ability of one type, A, to appear as and be used like another type, B