Article View: net.lang.c
Article #9385Re: Re: Expression sequencing query
From: Dale Worley
Date: Wed, 24 Sep 1986 20:08
Date: Wed, 24 Sep 1986 20:08
19 lines
1263 bytes
1263 bytes
> In article <760@oakhill.UUCP> tomc@oakhill.UUCP (Tom Cunningham) writes: > > /* a = b + b + b */ > > a = ((b=1),b) + ((b=2),b) + ((b=3),b) > > > >I expected the result to be 6. With the Microsoft C compiler and the > >compiler on the Sun 3, the result is 9. Apparently the parenthetical > >assignments are all getting done before the comma and addition. Any > >thoughts on this? Harbison&Steele (7.11) makes it clear that an implementation must evaluate one argument of a binary operator completely before starting evaluation of the other argument. Thus, the result should be 6. I don't know what the ANSI standard says. Dec VAX Ultrix gives 9. Lattice C 3.00 for MS-DOS gives 7!!! (Yes, that's "7", not a typo!) Dale
Technical Details
Message-ID:
<353@cullvax.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!mnetor!seismo!ll-xn!cullvax!drwReferences:
<760@oakhill.UUCP> <111@titan.UUCP>Show Full Headers
Complete Article Headers
Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!ll-xn!cullvax!drw From: drw@cullvax.UUCP (Dale Worley) Newsgroups: net.lang.c Subject: Re: Re: Expression sequencing query Message-ID: <353@cullvax.UUCP> Date: Wed, 24-Sep-86 16:08:32 EDT Article-I.D.: cullvax.353 Posted: Wed Sep 24 16:08:32 1986 Date-Received: Wed, 24-Sep-86 22:21:56 EDT References: <760@oakhill.UUCP> <111@titan.UUCP> Distribution: net Organization: Cullinet Software, Inc., Westwood, MA Lines: 19