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The meaning of each codepoint in the 129–256 (xA1–xFF) 'extended' range can be different in every encoding. In order to correctly interpret and display text data (sequences of characters) that includes extended codes, the software that reads or receives the text must use the specific extended ASCII encoding that was used to create it ...
For example, an ASCII (or extended ASCII) scheme will use a single byte of computer memory, while a UTF-8 scheme will use one or more bytes, depending on the particular character being encoded. Alternative ways to encode character values include specifying an integer value for a code point, such as an ASCII code value or a Unicode code point.
GB 18030 defines a one (ASCII), two (extended GBK), or four-byte (UTF) encoding. The two-byte codes are defined in a lookup table, while the four-byte codes are defined sequentially (hence algorithmically) to fill otherwise unencoded parts in UCS .
ASCII (/ ˈ æ s k iː / ⓘ ASS-kee), [3]: 6 an acronym for American Standard Code for Information Interchange, is a character encoding standard for electronic communication. . ASCII codes represent text in computers, telecommunications equipment, and other devic
A code point is a value or position of a character in a coded character set. [10] A code space is the range of numerical values spanned by a coded character set. [10] [12] A code unit is the minimum bit combination that can represent a character in a character encoding (in computer science terms, it is the word size of the character encoding).
As a result, high-quality typesetting systems often use proprietary or idiosyncratic extensions on top of the ASCII and ISO/IEC 8859 standards, or use Unicode instead. An inexact rule based on practical experience states that if a character or symbol was not already part of a widely used data-processing character set and was also not usually ...
Code page 1111 is similar, but replaces byte B0 ° (degree sign) with U+02DA ˚ (ring above). Windows-1250 is similar to ISO-8859-2 and has all the printable characters it has and more. However a few of them are rearranged (unlike Windows-1252 , which keeps all printable characters from ISO-8859-1 in the same place).
The decision to use any one encoding may depend on the language used for the documents, or the locale that is the source of the document, or the purpose of the document. Text may be ambiguous as to what encoding it is in, for instance pure ASCII text is valid ASCII or ISO-8859-1 or CP1252 or UTF-8. "Tags" may indicate a document encoding, but ...