Programming language questions:

1) What is abstraction?

2) What is an abstraction data type?

3) What are advantages of data abstraction?

4) Explain how the stack works?

5) In C++ what is a Friend class or Friend Function?

6) Explain how each of the following languages handle Information hiding, Constructors and destructors (GIVE EXAMPLES).

a. C++

b. Objective-C

c. C#

d. Java