From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: How to check a Float for NaN Date: Tue, 27 May 2014 10:35:29 +0200 Organization: cbb software GmbH Message-ID: <1ess31zdhcoz5.r5g03xyutz33$.dlg@40tude.net> References: <3132e38d-18bb-4890-9cec-31056ac6e3ba@x19g2000prg.googlegroups.com> <83ce619a-beef-447f-91ef-ff3dd68ff9df@googlegroups.com> <3tso4mcv80hk.8j7e1grtnha0$.dlg@40tude.net> <6c8f74c9-4b4e-47a0-90e0-efa1ecdd5e2e@googlegroups.com> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: QTaafVZuunHujkJPndFR7g.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:20053 Date: 2014-05-27T10:35:29+02:00 List-Id: On Fri, 23 May 2014 16:39:54 -0500, Randy Brukardt wrote: > That is, I see no > sensible reason for NaNs or infinities -- they're just ways of deferring > detection of bugs. I would have hoped that Ada's moved beyond that, just > like it has for integers.] Yes, from the engineering POV IEEE 754 is a great nuisance, as we want to report any bugs as early as possible. But as a mathematical construct (extended numeric sets) it is very elegant, e.g. surreal numbers: http://en.wikipedia.org/wiki/Surreal_number -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de