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Computer Science

Why is binary used in Computer Science

As we either have the presence or absence of an electroical volt

Define a character set

A complete set of characters and their unique number codes that is recognised by the computer hardware & software

What is the modern version of ASCII called. How many bits per character is used in it and what is it used for

Extended ASCII, uses 8 bits per character and used to represent characters like letters with accents

Give 2 features of ASCII

- Uses 7 bits per character
- The first 32 character are known as controlm characters

Why was Unicode created

To standardise the encoding of characters from all languages

Give 2 features of unicode

- Can apply a variable length encoding of either 16/32 bits
- The first 128 characters are the same as ASCII

Give a disadvantage of using Unicode

- It uses 4 bytes per character & takes up 4 times the amount of space compared to ASCII

How many bits is the Unicode character set

24

Give 2 ways of representing negative numbers

- Sign and magnitude
- Two's complement

Why is it better to write negative numbers as 2s complement rather than sign and magnitude

- It's easier to do arithmetic calculations with 2s complement

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