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From: bet@ecsvax.UUCP
Newsgroups: net.lang.c
Subject: Re: if((c=getchar())!=EOF)
Message-ID: <2618@ecsvax.UUCP>
Date: Wed, 30-May-84 12:28:04 EDT
Article-I.D.: ecsvax.2618
Posted: Wed May 30 12:28:04 1984
Date-Received: Fri, 1-Jun-84 07:53:42 EDT
Lines: 9

As has been said, "if((c=getchar())!=EOF)" is perfectly valid IFF "c" is
declared "int"; NOT if c is a char. Whether char variables are signed or
unsigned, for purposes of comparison or promotion to integer, is explicitly
undefined in C [ref K&R p. 40, p. 183]. This is established and documented.
It is an instance in which the definition of the language is explicitly
ambiguous to allow whatever implementation is more efficient on a particular
machine.
					Bennett Todd
					...{decvax,ihnp4,akgua}!mcnc!ecsvax!bet