Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!rlgvax!hadron!jsdy
From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: comp.lang.c
Subject: Re: CTRL(x)
Message-ID: <614@hadron.UUCP>
Date: Wed, 12-Nov-86 23:46:44 EST
Article-I.D.: hadron.614
Posted: Wed Nov 12 23:46:44 1986
Date-Received: Thu, 13-Nov-86 04:00:35 EST
References: <4880@brl-smoke.ARPA> <1319@sunybcs.UUCP>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Organization: Hadron, Inc., Fairfax, VA
Lines: 14
Summary: (x^0100) incorrect

In article <1319@sunybcs.UUCP> colonel@sunybcs.UUCP (Col. G. L. Sicherman) writes:
>) >But. . .is there a way to write an ANSI cpp version of
>) >        #define CTRL(c)
>		   ...  What's wrong with this old trick?
>	#define Q "
>	#define CTRL(z) (Q z "[1]^0100)

The XOR, (x^0100), will not generally work.  Use (x&037).  Also,
there was some concern that "..."[x] will not work where a
constant is required, such as in a case statement.
-- 

	Joe Yao		hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}
			jsdy@hadron.COM (not yet domainised)