Character set[edit]
The basic C source character set includes the following characters:
- Lowercase and uppercase letters:
a–zA–Z - Decimal digits:
0–9 - Graphic characters:
! " # % & ' ( ) * + , - . / : ; < = > ? [ \ ] ^ _ { | } ~ - Whitespace characters: space, horizontal tab, vertical tab, form feed, newline
Newline indicates the end of a text line; it need not correspond to an actual single character, although for convenience C treats it as one.
Additional multibyte encoded characters may be used in string literals, but they are not entirely portable. The latest C standard (C11) allows multinational Unicode characters to be embedded portably within C source text by using
\uXXXX or \UXXXXXXXX encoding (where the X denotes a hexadecimal character), although this feature is not yet widely implemented.
The basic C execution character set contains the same characters, along with representations for alert, backspace, and carriage return. Run-time support for extended character sets has increased with each revision of the C standard.
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