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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: net.lang.c
Subject: Re: op= construction
Message-ID: <1355@brl-smoke.ARPA>
Date: Sun, 15-Jun-86 01:46:38 EDT
Article-I.D.: brl-smok.1355
Posted: Sun Jun 15 01:46:38 1986
Date-Received: Sat, 21-Jun-86 07:38:30 EDT
References: <108@mruxe.UUCP>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 14

In article <108@mruxe.UUCP> cgw@mruxe.UUCP (C Waldman) writes:
-	In a loop, an array element is incremented, then the array index
-	is advanced to the next element. I recently coded this with
-	....
-	total[i++] += f;
-	....
-	After a couple of "Memory fault- core dumped" messages, I realized
-	that i is getting incremented twice. I broke it into two lines and
-	everything was ok, but I'm wondering why this construction doesn't
-	work.

Either you were incrementing i somewhere else too (e.g. in the for() head),
or else your compiler has a bug.  The whole point of the op= operators is
that the left side is supposed to be evaluated only once.