And don't forget the (early): 5 = 3
which, in at least some compilers, would indeed make subsequent references to "5" use "3". I think that was considered a bug. On Thu, Apr 26, 2018 at 11:26 AM, Binyamin Dissen < bdis...@dissensoftware.com> wrote: > On Thu, 26 Apr 2018 07:34:36 -0700 Phil Smith <p...@voltage.com> wrote: > > :>Binyamin Dissen wrote, in part: > :>>And for the non-Fortran programmer > :>> DO 25 I = 1,10 > :>>is identical to > :>> DO25I=1,10 > :>>but different than > :>> DO25I=1.10 > > :>For the non-FORTRAN geeks who are wondering why anyone would ever think > the last is the same: NASA had a bug due to this. While often blamed for > the Mariner 1 failure, it seems that may not have been the case after all, > but it's still interesting. See https://arstechnica.com/civis/ > viewtopic.php?t=862715 > > :>When you realized that > :> DO25I=1,10 > :>defines the start of a loop, but > :> DO25I=1.10 > :>is an assignment statement, you really wonder what about the FORTRAN > compiler parser! I'm sure it made sense at the time, and can see how it > would be done, but it still seems to me like a strange way to design a > language. > > Unlike COBOL which required white space, Fortran completely ignored white > space. Also, COBOL has reserved words - Fortran does not. > > The first step in compiling was to squash the statement (while paying > special > attention to FORMAT statements where you might have nnnH, while recognizing > that > > 30 FORMAT(I5,I10)=28 > > is a valid assignment statement (as long a FORMAT was declared as an array) > while > > 30 FORMAT(I5,I10,6H =28) ) > > is a Format statement > > -- > Binyamin Dissen <bdis...@dissensoftware.com> > http://www.dissensoftware.com > > Director, Dissen Software, Bar & Grill - Israel > > > Should you use the mailblocks package and expect a response from me, > you should preauthorize the dissensoftware.com domain. > > I very rarely bother responding to challenge/response systems, > especially those from irresponsible companies. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- zMan -- "I've got a mainframe and I'm not afraid to use it" ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
