From -2564089305181423152 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: jtorjo@yahoo.com (John Torjo) Newsgroups: comp.std.c++ Subject: Re: Pi, Euler Number, and perhaps other 'natural' constants? Date: Wed, 28 Jul 2004 15:55:11 GMT Organization: http://groups.google.com Lines: 39 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 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: news.demon.co.uk 1091030116 18281 158.152.254.254 (28 Jul 2004 15:55:16 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Wed, 28 Jul 2004 15:55:16 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) 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=-2.2 required=5.2 tests=AWL,BAYES_00, FORGED_YAHOO_RCVD,FOR_FREE autolearn=no version=2.60-mulga_r1 X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i6SFtBwc014962; Thu, 29 Jul 2004 01:55:11 +1000 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-NNTP-Posting-Date: Wed, 28 Jul 2004 12:53:37 +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++:1474 "Steven T. Hatton" wrote in message news:<5cydnSisJNo4yJncRVn-sQ@speakeasy.net>... > I was a bit surprised that the Standard does not specify that the constant > Pi be part of an implementation. It seems like an obvious feature to want > in a programming language. The Euler Number would also be nice, but not > nearly as desirable as Pi. Sure there are questions of how to handle the > difference between a float and a double Pi, but I'm (almost) sure that > isn't a big obstacle. > > I've found ways to jump though hoops to get Pi defined by using > transcendental functions provided in the Standard Library, but that seems a > bit convoluted to me. Is there a reason Pi is missing from C++? As others have pointed out, it's got an imprecise value, etc. However, as I remember Paul Bristow is working on adding something to boost. Best, John John Torjo Freelancer -- john@torjo.com Contributing editor, C/C++ Users Journal -- "Win32 GUI Generics" -- generics & GUI do mix, after all -- http://www.torjo.com/win32gui/ Professional Logging Solution for FREE -- http://www.torjo.com/code/logging.zip (logging - C++) -- http://www.torjo.com/logview/ (viewing/filtering - Win32) -- http://www.torjo.com/logbreak/ (debugging - Win32) (source code available) --- [ 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 ]