WHAT IS THE MODULARITY IN OOP? AND WHAT IS HIERARCHY? AND WHATS THE DIFFERENCE BETWEEN BOTH AND INHERITANCE?

Answer 1

First, don't use all caps. It is harder to read and online it is like SHOUTING.

Since this is not my area of expertise, I searched Google under the key words "OOP" to get this:

http://www.google.com/search?client=safari&rls=en&q=OOP&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.