Representing Characters (OCR GCSE Computer Science): Flashcards
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Practise the cards
14 cards from this deck
Character set definition
Character set definition
A collection of characters that a computer can represent using binary codes
ASCII bit count
ASCII bit count
7 bits
ASCII character count
ASCII character count
128 characters
Extended ASCII bit count
Extended ASCII bit count
8 bits
Extended ASCII character count
Extended ASCII character count
256 characters
Unicode bit count
Unicode bit count
16 bits
Unicode character count
Unicode character count
65,536 characters
Binary for 'A' in ASCII
Binary for 'A' in ASCII
01000001
Binary for 'B' in ASCII
Binary for 'B' in ASCII
01000010
ASCII limitation
ASCII limitation
Only 128/256 chars, insufficient for all languages/symbols
How Unicode solves ASCII problem
How Unicode solves ASCII problem
Uses 16 bits for much larger character range
Logical ordering in character sets
Logical ordering in character sets
Binary codes sequential (e.g., 'B' = 'A' + 1)
ASCII '1' vs pure binary 1
ASCII '1' vs pure binary 1
ASCII '1' is 00110001 (49); pure binary 1 is 00000001
Arithmetic on ASCII number characters
Arithmetic on ASCII number characters
Cannot do directly; must convert to pure binary first