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From: davidsen@crdos1.crd.ge.COM (Wm E Davidsen Jr)
Newsgroups: comp.lang.c
Subject: Re: CTRL(x) macro (was: Re: What is a constant expression)
Message-ID: <1422@crdos1.crd.ge.COM>
Date: 24 Oct 89 17:02:45 GMT
References: <1219@crdos1.crd.ge.COM> <8891@goofy.megatest.UUCP> <3786@solo6.cs.vu.nl>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: GE Corp R&D Center
Lines: 19

In article <3786@solo6.cs.vu.nl>, maart@cs.vu.nl (Maarten Litmaath) writes:
|  
|  	#define CTRL(x) ((x) ^ 0100)
|  
|  ...so you can say
|  
|  	CTRL('?')
|  
|  to get DEL.

  You should use another name, perhaps, since many people assume that
CTRL returns control characters. They are defined as the values from
00-37 octal, from the action of the Control key on the original Teletype
terminals. 
-- 
bill davidsen	(davidsen@crdos1.crd.GE.COM -or- uunet!crdgw1!crdos1!davidsen)
"The world is filled with fools. They blindly follow their so-called
'reason' in the face of the church and common sense. Any fool can see
that the world is flat!" - anon