Path: utzoo!attcan!uunet!murtoa.cs.mu.oz.au!munnari.oz.au!comp.vuw.ac.nz!dsiramd!csnz!paul
From: paul@csnz.co.nz (Paul Gillingwater)
Newsgroups: comp.lang.c
Subject: Re: Dumb question: What IS a trigraph?
Message-ID: <103@csnz.co.nz>
Date: 19 Aug 89 23:09:23 GMT
References: <3566@uwovax.uwo.ca>
Reply-To: paul@csnz.co.nz (Paul Gillingwater)
Organization: Computer Sciences of NZ Limited
Lines: 29

In article <3566@uwovax.uwo.ca> 2014_5001@uwovax.uwo.ca writes:
>Every so often someone mentions a trigraph.  What is a trigraph???

May I refer you to page 229 of the Kernighan and Ritchie Bible,
"The C Programming Language" (2nd. ed.).  Also, page 259 (Appendix C,
"Summary of Changes") states:
	'Trigraph sequences introduced by ?? allow representation of
characters lacking in some character sets.'

This substitution is usually performed by a preprocessor.  For instance,
the following are valid trigraphs:
	??=	#	??(	[	??<	{
	??/	\	??)	]	??>	}
	??'	^	??!	|	??-	~

>I have programmed in C for 3 years, and the only time I met the word was when I
>was reading a graph-theory book (and I cannot remember what that definition
>was).
You've programmed in C for 3 years and haven't read the Bible according
to K & R (revised ed.) ??

>Please enlighten me.
The pointer to NULL is not the whole of the dhamma.  Mu!

>Alexander Pruss, at one of: Department of Applied Mathematics, Astronomy,
-- 
Paul Gillingwater, Computer Sciences of New Zealand Limited
Bang: ..!uunet!dsiramd!csnz!paul    Domain: paul@csnz.co.nz
Call Magic Tower BBS V21/23/22/22bis 24 hrs +0064 4 767 326