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Since the C99 standard, C supports escape sequences that denote Unicode code points, called universal character names. They have the form \uhhhh or \Uhhhhhhhh, where h stands for a hex digit. Unlike other escape sequences, a universal character name may expand into more than one code unit.
Many Unicode characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character (U+0000 NULL) is used in C-programming application environments to indicate the end of a string of characters.
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;
There are a number of techniques to display non-printing characters, which may be illustrated with the bell character in ASCII encoding: Code point: decimal 7, hexadecimal 0x07; An abbreviation, often three capital letters: BEL; A special character condensing the abbreviation: Unicode U+2407 (␇), "symbol for bell"
The Unicode Standard states that "The universe of symbols is rich and open-ended," but that in order to be considered, a symbol must have a "demonstrated need or strong desire to exchange in plain text." [1] This makes the issue of what symbols to encode and how symbols should be encoded more complicated than the issues surrounding writing ...
In the C programming language (and other languages derived from C), the form feed character is represented as '\f'. Unicode also provides the character U+21A1 ↡ DOWNWARDS TWO HEADED ARROW as a printable symbol for a form feed (not as the form feed itself). [1] The form feed character is considered whitespace by the C character classification ...
The space is considered to be both a graphic character and a control character in ISO 646. [1] It can be considered as a character with a visible form or, in contexts such as teleprinters, a control character that advances the print head without printing a character. The delete character is strictly a control character, not a graphic character.
This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. General-purpose programming language "C programming language" redirects here. For the book, see The C Programming Language. Not to be confused with C++ or C#. C Logotype used on the cover of the first edition of The C Programming Language Paradigm Multi-paradigm: imperative (procedural ...