From 1345141335880788568 X-Google-Thread: f78e5,2e0dbc7156d5459 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII Path: g2news1.google.com!news2.google.com!proxad.net!proxad.net!194.159.246.34.MISMATCH!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: radekg@b-runner.nospam.org (Radoslaw Grzanka) Newsgroups: comp.std.c++ Subject: Re: "Undefined Behaviour" or "Non-portable" Date: Thu, 5 Aug 2004 18:03:24 GMT Organization: tp.internet - http://www.tpi.pl/ Lines: 48 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: References: NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: quoted-printable X-Trace: news.demon.co.uk 1091729010 2854 158.152.254.254 (5 Aug 2004 18:03:30 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 5 Aug 2004 18:03:30 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-User-Agent: Pan/0.14.2.91 (As She Crawled Across the Table (Debian GNU/Linux)) X-MIME-Autoconverted: from 8bit to quoted-printable by mulga.cs.mu.OZ.AU id i75I3Pjp024940 X-Spam-Checker-Version: SpamAssassin 2.60-mulga_r1 (1.212-2003-09-23-exp) on mulga.cs.mu.OZ.AU X-Spam-Status: No, hits=-4.9 required=5.2 tests=BAYES_00 autolearn=ham version=2.60-mulga_r1 X-Virus-Scanned: by amavisd-new at TP Internet X-Path: comp-std-cpp-robomod!not-for-mail X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i75I3OwF024925; Fri, 6 Aug 2004 04:03:24 +1000 (EST) X-NNTP-Posting-Date: Wed, 4 Aug 2004 20:34:59 +0000 (UTC) X-Spam-Level: X-Delivered-To: std-c++@ucar.edu X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++ Xref: g2news1.google.com comp.std.c++:1549 Dnia Wed, 04 Aug 2004 20:19:03 +0000, JKop napisa=B3(a): > Would you classify the following code as "Undefined Behaviour" or as "N= on- > portable"? >=20 > signed main() > { > signed char chedder =3D 130; > } >=20 >=20 > Relevant information: >=20 > 1) Minimum range for a signed char: -127 to 127 > 2) Overflow for a signed integral type is Undefined Behaviour > 3) There's no maximum range for a signed char >=20 > If the program is run on a system with a 9-Bit char, then there's no=20 > overflow, and as such there's no Undefined Behaviour. >=20 > But overall would you classify it as "Undefined Behaviour" or "Non- > portable"? If 2) is right (I didn't remember about that) I would say both. It is non-portable from machines with more than 8 bits per char and undefined behaviour on machines with 8 bits and less per char. Radoslaw. --=20 "Oceniaj=B1 mnie, cho=E6 nic o mnie nie wiedz=B1. To dlatego jestem sam" = - Shrek =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D e-mail: sad[na]rpg[kropka]pl JID: radekg[na]jabber[kropka]atman[kropka= ]pl L:C++ E+++ T-- !R P+++ D G++ F:ADoM RL--- !RLA W:CP Q++ AI++ RN+ Hp- Re++= S+ --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]