The C source code character set is a superset of the ISO 646-1983 Invariant
Code Set. To enable programs to be represented in the reduced set, trigraph
sequences are defined to represent those characters not
in the reduced set. A trigraph is a three character
sequence that is replaced by a corresponding single character. Table
7-2 gives the complete list of trigraph sequences and their replacement
characters.
Table 7-2 Trigraph Sequences and Replacement Characters
Trigraph Sequence | Replacement |
|---|
??= | # |
??/ | \ |
??' | ^ |
??( | [ |
??) | ] |
??! | | |
??< | { |
??> | } |
??- | ~ |
Any ? that does not begin one of the trigraphs listed
above is not changed.
-notrigraph |
 |
In the ANSI extended (-Ae) mode, trigraph translation is automatically done.
The option, -notrigraph will disable automatic
translation of trigraph sequences.
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