Abstraction

Question 1

What is representational abstraction?

Answer 1

A technique in which excessive details are removed to arrive at a representation of a problem that consists of only the key features.

Question 2

Which form of abstraction involves grouping together similarities within a problem to identify what kind of problem it is?

Answer 2

Abstraction by generalisation.

Question 3

What is meant by data abstraction?

Answer 3

A form of abstraction in which details about how data is being stored are hidden.

Question 4

What kind of problems make use of multiple levels of abstraction?

Answer 4

Large complex problems.

Question 5

How does abstraction allow non-experts to make use of a system?

Answer 5

Hides complex and irrelevant information in abstract models.

Question 6

State two advantages of using abstraction in software development.

Answer 6

1. Easier for programmers to focus on core elements. 2. Reduces the time needed to be spent on the project. 3. Prevents program from getting unnecessarily large.

Question 7

Give two applications of layers of abstraction.

Answer 7

1. Networking TCP/IP layer. 2. Programming languages.

Question 8

State two advantages of using abstraction in programming languages.

Answer 8

1. Easier to remember syntax in high-level languages as it is closer to natural language. 2. Coding becomes accessible to beginners.

Question 9

How does object-oriented programming use abstraction?

Answer 9

Objects are an abstraction for real-world entities. Attributes are an abstraction for the characteristics of an object. Methods are an abstraction for the actions a real-world object is able to perform.

Question 10

What is the difference between abstraction and reality?

Answer 10

Abstraction is a simplified representation of reality.