From 4171494250834187289 X-Google-Thread: f78e5,4ba9dcb1ae436e16 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit 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: nagle@animats.com (John Nagle) Newsgroups: comp.std.c++ Subject: Re: Pi, Euler Number, and perhaps other 'natural' constants? Date: Thu, 29 Jul 2004 04:50:20 GMT Organization: SBC http://yahoo.sbc.com Lines: 27 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: References: <5cydnSisJNo4yJncRVn-sQ@speakeasy.net> NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.demon.co.uk 1091076628 2801 158.152.254.254 (29 Jul 2004 04:50:28 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 29 Jul 2004 04:50:28 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.6) Gecko/20040113 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=-3.3 required=5.2 tests=AWL,BAYES_00 autolearn=ham version=2.60-mulga_r1 X-Accept-Language: en-us, en, ja X-UserInfo1: TSUGW^_D\JUQB\D[NCOF_W\@PJ_^PBQLGPQRJVMHQAVTUZ]CLNTCPFK[WDXDHV[K^FCGJCJLPF_D_NCC@FUG^Q\DINVAXSLIFXYJSSCCALP@PB@\OS@BITWAH\CQZKJMMD^SJA^NXA\GVLSRBD^M_NW_F[YLVTWIGAXAQBOATKBBQRXECDFDMQ\DZFUE@\JM 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 i6T4oKWe029368; Thu, 29 Jul 2004 14:50:20 +1000 (EST) X-NNTP-Posting-Date: Wed, 28 Jul 2004 13:42:38 EDT X-Spam-Level: X-Delivered-To: std-c++@ucar.edu X-Spamscanner: mailbox7.ucsd.edu (v1.4 May 20 2004 13:55:33, 0.0/5.0 2.63) X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++ X-MailScanner: PASSED (v1.2.8 2601 i6SHherJ016052 mailbox7.ucsd.edu) Xref: g2news1.google.com comp.std.c++:1483 Alberto Barbati wrote: > John Nagle wrote: > >> Daniel Pfeffer wrote: >> >> We should have "std::pi" as a double, accurate to the last bit >> of a double, even if it has to be calculated offline and >> stored as a hex float. This is worth doing, because it's >> a huge pain to do that and it only needs to be done once. >> > > Should std::pi be a constant? As my current programming platform is > ix86-based I would prefer having a function instead. That's because > there is a FPU instruction ... This is an argument for 80-bit floating point support in C++. What's the thinking on that? Most FPUs in the world today have support for it. John Nagle --- [ 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 ]