Path: utzoo!yunexus!stpl!bbm!darcy
From: darcy@bbm.UUCP (D'Arcy Cain)
Newsgroups: comp.lang.c
Subject: Re: register variable???
Message-ID: <789@bbm.UUCP>
Date: 11 Sep 89 17:29:19 GMT
Article-I.D.: bbm.789
References: <30585@srcsip.UUCP>
Reply-To: darcy@bbm.UUCP (darcy)
Organization: BBM Bureau of Measurement, Toronto
Lines: 20

In article <30585@srcsip.UUCP> sklee@srcsip.UUCP () writes:
>  while (i < 4)  list[i] = list[++i];
I have always been too scared to take a chance on this type of code.  It
seems to me that it is subject to compiler interpretation as to when the
++ operator is applied.  Example on the first iteration:

    list[0] = list[1];
or
    list[1] = list[1];

I don't actually know if either is guaranteed by some standard but even
if it is I wouldn't want to depend on such a guarantee on a specific
compiler having seen how some of them implement "standards".  I would
use the following replacement for the above line:

	for (i = 0; i < 4; i++) list[i] = list[i + 1];
which keeps the increment out of the loop.

D'Arcy J.M. Cain
(darcy@bbm, darcy@cain)