1.4.1 Data Types

Question 1

What data type should be used for storing a phone number like 07886756443?

Answer 1

String
Numeric types would omit the leading 0.

Question 2

Which data type stores a collection of characters?

Answer 2

String

Question 3

Which data type stores just True and False?

Answer 3

Boolean

Question 4

What is the effect of a logical shift left by one place?

Answer 4

Multiplication by 2

Question 5

What is a character set?

Answer 5

A character set is a published collection of codes and corresponding characters which can be used by computers for representing text.

Question 6

What is ASCII?

Answer 6

ASCII uses 7 bits to represent 2^7 = 128 different characters.

Question 7

What is Unicode, and why is it better than ASCII?

Answer 7

Unicode uses a varying number of bits allowing for over 1 million different characters, many of which have yet to be allocated. Because of this, Unicode has enough capacity to represent a wealth of different languages, symbols and emoji.