Category
Pragma equivalent
#pragma options [no]digraph
Purpose
Enables recognition of digraph
key combinations 
and operator keywords
to
represent characters that are not found on some keyboards. Digraph
key combinations include <:, <%,
and so on. Operator keywords include and, or,
and so on.
Defaults
-qdigraph when the extc89 | extended
| extc99 | stdc99 language level is in effect. -qnodigraph for
all other language levels.- -qdigraph
Usage
A digraph is a keyword or combination of keys that lets you produce a character that is not available on some keyboards. For details on digraphs, see Digraph characters .
Predefined macros
__DIGRAPHS__ is predefined to 1 when -qdigraph is in effect; otherwise it is not defined.
Examples
To disable digraph character sequences when compiling your program, enter:
xlc myprogram.c -qnodigraph