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From: toml@druxm.UUCP (LaidigTL)
Newsgroups: net.unix-wizards
Subject: Re: getc() != EOF
Message-ID: <862@druxm.UUCP>
Date: Wed, 30-May-84 16:38:24 EDT
Article-I.D.: druxm.862
Posted: Wed May 30 16:38:24 1984
Date-Received: Sat, 2-Jun-84 07:29:55 EDT
References: <30@utastro.UUCP> <307@basser.SUN>, <407@drutx.UUCP>
Organization: AT&T Information Systems Laboratories, Denver
Lines: 16

> Char variables are promoted to int in expressions (see C manual)
> and a char -1 is IDENTICAL with an int -1. Unsigned char c could be
> different (Any C implementors there? (kvm?)). 
> 
> Chris Maltby
> University of Sydney

Jim Shankland answered this adequately, but for those who feel that only
the C Reference Manual contains truth, see page 183 (section 6.1,
"Characters and integers").  Note that of the four machines they
describe, only one sign-extends (converts a char whose leftmost bit is
one to a negative int).

		Tom Laidig
		AT&T Information Systems Laboratories, Denver
		...!ihnp4!druxm!toml