Path: utzoo!attcan!uunet!mcvax!unido!rwthinf!rwthbs!hls
From: hls@rwthbs.UUCP (H.L. Stahl)
Newsgroups: comp.lang.c
Subject: Re: down
Message-ID: <318@rwthbs.UUCP>
Date: 12 Dec 88 11:47:32 GMT
References: <gables.352@umigw.miami.edu>
Reply-To: hls@rwthbs.UUCP (H.-L. Stahl)
Organization: RWTH Aachen, Lehrstuhl f. Betriebssysteme
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In article <gables.352@umigw.miami.edu> slores%gables.span@umigw.miami.edu (Stanislaw L. Olejniczak) writes:
>PLEASE don't flame for posting too simple a question.  I think the following
>SHOULD work, but will not even compile:
>	while ( (c = getchar) != EOF)
>		chcnt++ += (c == '\n');
>... this would be too complex for a compiler. ...

The answer is quite simple: "+=" is an assignment operator, on it's left side
are only "lvalue"s allowed. But "chcnt++" is an expression with the result
"1 + previous_value(chcnt)", and you cannot assign anything to an expression,
even in C ...

I hope this helps!

Hans-Ludwig Stahl