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From: karl@haddock.UUCP (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: CTRL(x)
Message-ID: <170@haddock.UUCP>
Date: Thu, 13-Nov-86 10:28:31 EST
Article-I.D.: haddock.170
Posted: Thu Nov 13 10:28:31 1986
Date-Received: Thu, 13-Nov-86 21:48:09 EST
References: <4880@brl-smoke.ARPA> <1319@sunybcs.UUCP> <614@hadron.UUCP>
Reply-To: karl@haddock.UUCP (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 10
Summary: XOR is indeed preferable to AND, because DEL is "^?"

In article <614@hadron.UUCP> jsdy@hadron.UUCP (Joseph S. D. Yao) writes:
>The XOR, (x^0100), will not generally work.  Use (x&037).

True if you want the domain of the function to include lowercase.  I never
do; e.g. I claim that the proper name for EOT is "^D" rather than "^d".  If
you're willing to make this restriction, then the XOR has the advantage of
allowing the use of CTRL('?') for DEL, which is a widely (though by no means
universally) accepted notation.

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint