How character sets (ASCII and UNICODE) are used to represent text
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What is meant by a character set?
A character set is a published collection of codes and corresponding characters which can be used by computers for representing text - E.g. ASCII and Unicode
What is meant by ASCII?
American Standard Code for Information Interchange • Was the leading character set before Unicode • Codes for numbers and symbols (128 characters) • Disadvantage - limited character set/representing other languages with different characters
What is meant by unicode?
• Unicode solves the problem of ASCII’s limited character set • Uses a varying number of bits, allowing for over 1 million different characters • Different languages, symbols and emojis
Explain the trade-off between accuracy and range when representing numbers and give an example
• Larger mantissa increases accuracy • Smaller exponent decreases range • E.g. X = 64 and Y = 1.75