You can use any of the following characters from the ASCII character set to enter programming text into your source file.
a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9
! " # % & ' ( ) * + , - . / :
; < = > ? [ \ ] ^ _ { | } ~
In extended and compatible language levels, the compiler
allows the $ (dollar sign) character in C++ identifiers to
facilitate calls between different languages and porting code. In
ansi language level, the $ (dollar sign) character is not
permitted in C++ identifiers. The default language level for the
compiler is extended. Language level is set with the #pragma
langlvl or the /S option on Intel, langlvl option on AIX.
Some characters from the C
character set are not available in all environments. You can
enter these characters into a C source file using a sequences of
two or three characters. A sequence of three characters called a
trigraph. A sequence of two characters is called a digraph,
but will be accepted by the compiler only if the -qdigraph
compiler option is in effect on AIX. Digraph or trigraph
character sequences appearing in character or string literals are
not replaced during the preprocessor stage.
Digraph and trigraph sequences available to you are:
| Digraph and Trigraph Sequences | |||
| Digraphs | Trigraphs | Character(s) Represented | Description |
|---|---|---|---|
| <: | ??( | [ | left bracket |
| :< | ??) | ] | right bracket |
| <% | ??< | { | left brace |
| %> | ??> | } | right brace |
| ??/ | \ | backslash | |
| ??' | ^ | caret | |
| ??! | | | pipe | |
| ??- | ~ | tilde | |
| %: | ??= | # | pound sign |
| %:%: | ## | preprocessor macro concatenation operator | |
Digraph, Trigraph, and Escape
Sequences
