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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1094ba,9f0bf354542633fd X-Google-Attributes: gid1094ba,public X-Google-Thread: 103376,d901a50a5adfec3c X-Google-Attributes: gid103376,public From: dewarr@my-dejanews.com Subject: Re: Fortran or Ada? Date: 1998/09/25 Message-ID: <6uenmo$fov$1@nnrp1.dejanews.com>#1/1 X-Deja-AN: 394550821 References: <36068E73.F0398C54@meca.polymtl.ca> <6u8r5o$aa4$1@nnrp1.dejanews.com> <360A3446.8AD84137@lmco.com> <6udre0$ha1$1@nnrp1.dejanews.com> X-Http-Proxy: 1.0 x8.dejanews.com:80 (Squid/1.1.22) for client 205.232.38.14 Organization: Deja News - The Leader in Internet Discussion X-Article-Creation-Date: Fri Sep 25 00:21:45 1998 GMT Newsgroups: comp.lang.fortran,comp.lang.ada X-Http-User-Agent: Mozilla/2.02 (OS/2; I) Date: 1998-09-25T00:00:00+00:00 List-Id: In article , eachus@spectre.mitre.org (Robert I. Eachus) wrote: > In article <6udre0$ha1$1@nnrp1.dejanews.com> dewarr@my-dejanews.com writes: > > > or Fortran: > > > Do 10 i = 1.6 > > > the latter being the (in)famous bug at the heart of the urban > > legend that the Venus probe died because of this bug :-) > > For the record, the launch did fail do to a single character error. > But the error was in transcribing the control equations for the > booster, not in the actual code derived from them. The error didn't > manifest itself on earlier launches, because the instability was > second-order. My best understanding is that the DO I = 1.6 type bug was actually in the code at one time, but discovered during simulation. Incidentally there is a remarkable APAR for IBSYS Fortran IV dated around 1967 which read something like "The Fortran compiler miscompiles [the above type of DO] and treats it as an assignment statement. This will be corrected in a future release." TO my knowledge this APAR was never closed :-) -----== Posted via Deja News, The Leader in Internet Discussion ==----- http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum