character encoding

(redirected from Character sets)
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Related to Character sets: ASCII, Character encoding

character encoding

(character)
(Or "character encoding scheme") A mapping of binary values to code positions and back; generally a 1:1 (bijective) mapping.

In the case of ASCII, this is generally a f(x)=x mapping: code point 65 maps to the byte value 65, and vice versa. This is possible because ASCII uses only code positions representable as single bytes, i.e., values between 0 and 255, at most. (US-ASCII only uses values 0 to 127, in fact.)

Unicode and many CJK coded character sets use many more than 255 positions, requiring more complex mappings: sometimes the characters are mapped onto pairs of bytes (see DBCS). In many cases, this breaks programs that assume a one-to-one mapping of bytes to characters, and so, for example, treat any occurrance of the byte value 13 as a carriage return. To avoid this problem, character encodings such as UTF-8 were devised.
References in periodicals archive ?
The CL6NX includes: a 3.5" full-color display and built-in/customizable video tutorials; a tool-free print head and platens replacement; an aluminum diecast construction; and over 30 display languages and 40 print character sets.
Provision of educational character sets for the city of Puteaux, the municipal social welfare center of Puteaux and Puteaux Fund Schools
This technological breakthrough is foundational to the future support for other full-width character sets, like Chinese and Korean.
There's more fun with the 2-in-1 Toy Story 3 Trade Up & Happy Families Card Game: The Trade Up game unleashes a bidding war, as each round is won with the highest card and 6-card character sets have to be accumulated.
As in GOS, these are arranged into sets, each containing 64 characters, and corresponding as far as possible with the GOS character sets. In order to display a single character, the user will normally specify the character set containing the character and then use the appropriate display routing,
He introduces the product with a case study database as he instructs on installation and theory, moving to querying and updating data, using SELECT statements with table expressions and subqueries (with encyclopedic coverage of the relevant statements and clauses), loading and unloading data, updating tables, creating database objects by with tables and integrity constraints, creating character sets and collations, changing and dropping tables, using indexes, setting up databases and applying security measures.
It complies with the Unicode language standard, enabling it to handle non-Roman character sets, such as Chinese, Arabic and Punjabi.
Tools And Techniques For Character Interpretation: A Handbook Of Psychology For Actors, Writers And Directors covers all the basics; from interpreting the underlying psychology of scenes and approaches to analyzing character sets and scope.
Sir Ian, whose character sets up home with Emily and Norris, said: "The script is hilarious."
They are stunned when the author, complete with large-rimmed glasses and fisherman's-style cap, walks in His character sets up home with Emily (Eileen Derbyshire) and Norris (Malcolm Hebden) before it becomes apparent that the literary idol is not all he seems.
Developers eventually created a mixed single byte/double byte character set for Japanese, but it was a huge amount of work and most companies did not want both character sets to clutter their U.S.