HP C/iX Reference Manual (31506-90011)

Chapter 7 113
Preprocessing Directives
Trigraph Sequences
Trigraph Sequences
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.
Any ? that does not begin one of the trigraphs listed above is not changed.
NOTE Trigraphs are replaced in ANSI mode only.
Table 7-2. Trigraph Sequences and Replacement Characters
Trigraph
Sequence
Replacement
?? #
??/
??' ^
??( [
??) ]
??! |
?? {
?? }
??-~