From -4385534897396802093 X-Google-Thread: f78e5,e2cfdf64f67c7793 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news1.google.com!news.glorb.com!news.zanker.org!news.clara.net!wagner.news.clara.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: walter@digitalmars.nospamm.com ("Walter") Newsgroups: comp.std.c++ Subject: Re: Eliminating uninitialised variables Date: Thu, 23 Sep 2004 06:18:59 GMT Organization: Comcast Online Lines: 26 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: References: <4150695d@andromeda.datanet.hu> NNTP-Posting-Host: news.news.demon.net X-Trace: news.demon.co.uk 1095920343 24037 158.152.254.254 (23 Sep 2004 06:19:03 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 23 Sep 2004 06:19:03 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Priority: 3 X-Spam-Checker-Version: SpamAssassin 2.64-mulga_r1 (2004-01-11) on mulga.cs.mu.OZ.AU X-Spam-Status: No, hits=-3.4 required=5.0 tests=AWL,BAYES_00,PRIORITY_NO_NAME autolearn=no version=2.64-mulga_r1 X-MSMail-Priority: Normal X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i8N6IxDb021794; Thu, 23 Sep 2004 16:18:59 +1000 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-NNTP-Posting-Date: Wed, 22 Sep 2004 22:16:38 GMT 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-Newsreader: Microsoft Outlook Express 6.00.2800.1437 X-Newsgroups: comp.std.c++ Xref: g2news1.google.com comp.std.c++:2851 "Dave Harris" wrote in message news:memo.20040922200512.2520C@brangdon.m... > I'm pretty sure IEEE allows all bits 0 for 0.0, but whatever. It does. All bits 0 is +0.0 for IEEE 754 floating point encodings. D, however, default initializes floating point values to the NaN bit pattern, not 0. This has bug finding advantages because it causes the programmer to have to think about what value it should be initialized to, rather than inadvertantly using 0.0 which may become a hidden bug. It's too bad there is no NaN pattern for integer types. Even better would be a memory bit per location that could be set to "uninitialized" which would cause a trap if that location was read. I wonder some times how many latent bugs of this nature are in shipping applications . -Walter www.digitalmars.com free C/C++/D compilers --- [ 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 ]