1.4.1 Data Types

Question 1

Define character

Answer 1

Single symbol used by a computer

Question 2

Define string

Answer 2

Collection of characters

Question 3

What denary numbers do A, B, C, D, E, F in hex represent?

Answer 3

10, 11, 12, 13, 14, 15

Question 4

What does ASCII stand for?

Answer 4

American Standard Code for Information Interchange

Question 5

How does ASCII represent characters?

Answer 5

Using 7 bits to represent 2^7=128 different characters.

Question 6

Define the character set of a computer.

Answer 6

A published collection of codes and corresponding characters which can be understood and used by computers for representing text.

Question 7

How are codes used to represent a character set?

Answer 7

Each character has a unique binary code.
Each character uses 1 byte.
ASCII is an example.

Question 8

How does Unicode solve ASCII’s problem of limited characters?

Answer 8

It uses a varying number of bits allowing for over 1 million different characters, many of which have yet to be allocated.

Question 9

What else can we afford to represent with Unicode’s vast capacity?

Answer 9

Different languages, symbols, emojis