Flashcards in ASCII / UNICODE Deck (13)
What is a character set?
A collection of characters and the binary code used to represent them
How many bits does standard ASCII use to represent a character?
7 bits are used to represent a character
How many characters can be represented in standard ASCII?
2^7 = 128 different characters
What is the range of characters that can be represented in standard ASCII?
0 - 127
When is an 8th bit sometimes added to standard ASCII ?
It's sometimes used as a parity bit for error checking during transmission
How many bits does extended ASCII use to represent a character?
8 bits are used to represent a character
How many characters can be represented in extended ASCII?
2^8 = 256 different characters
What is the range of characters that can be represented in extended ASCII?
How many coding standards does Unicode support?
Unicode supports 3 standards
UTF-8 , UTF-16, UTF-32
What advantage is gained from using Unicode as the character set over ASCII?
ASCII can only represent a fixed amount of characters due to how many bits it uses so it limits how many characters it can represent whereas Unicode uses more bits so can represent a greater amount of characters, such as characters used in different languages/alphabets
What is a character code?
A binary pattern equivalent of a character
What is a disadvantage of using Unicode?
It uses more bytes per character so uses more storage space per character