Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!asuvax!hrc!gtephx!reesd
From: reesd@gtephx.UUCP (David Rees)
Newsgroups: comp.lang.c
Subject: Re: comma operator
Summary: Comma Operator Evaluation Order
Message-ID: <44c53d5b.f9df@gtephx.UUCP>
Date: 1 Aug 89 15:31:00 GMT
References: <10099@mpx2.mpx.com> <93@microsoft.UUCP> <10100@mpx2.mpx.com> <1989Jul28.174033.12734@jarvis.csri.toronto.edu>
Organization: AG Communication Systems, Phoenix, Arizona
Lines: 13

> dandb@k.gp.cs.cmu.edu (Dean Rubine) writes:
> >I also occasionally use the comma to save braces:
> >	if((f = fopen(file, "r")) == NULL)
> >		fprintf(stderr, "Can't open %s\n", file), exit(2);

WOuldn't this cause problems based on the order of evaluation? I know
that the evalaution of the variables can be either left to right,
or right-to-left (depending on the machine). Does this mean that the
order of execution would also depend on the machine? Also by using
braces and semi-colons we know exactly what order things are going
to go in. Of course, it does save braces.

		-Dave