2.3

Question 1

How is the ASCIl character set used to represent text in a computer ?

Answer 1

Each character is assigned a unique character code

Each letter is converted to its character code (which is a binary number)

Question 2

Why is ASCII not suitable for representing text in all the languages of the world ?

Answer 2

ASCII uses only 7 bits…

So can only represent 128 distinct characters

Question 3

How many bits does ASCII use

Answer 3

7

Question 4

What is a character set ?

Answer 4

The characters a computer uses

Question 5

Why is data stored in binary in computers ?

Answer 5

Circuit only needs to check for two states

1 and 0

Question 6

Compare the use of ASCII and Extended ASCII to represent characters ?

Answer 6

Extended ASCII uses more bits

Extended ASCII can represent more characters

For example, Extended ASCII can represent other languages (eg European languages)

Question 7

How many bits does Extended ASCII use ?

Answer 7

8

Question 8

How many unique characters does Extended ASCII represent in total ?

Answer 8

256

Question 9

How many bits does Unicode use ?

Answer 9

16

Question 10

How many characters does Unicode represent ?

Answer 10

2^16

65,536 unique characters