2- a) What is Encapsulation? (3 points) b) In programming languages, what does it used for? (4 points)

3- a) What is the constructor of a class?

b) In some programming languages the class constructor must have a specific name while in some other languages, the class constructor can have any name. Describe the cons and pros of each approach.

4- a) What is a Class? b) What is the difference between a Class and an Object?

5- What are the advantages of Information Hiding?

6- a) What is an Abstract Data Type? Give an example

b) What are the benefits of data abstraction?