Path: utzoo!utgpu!attcan!uunet!tektronix!tekcae!kurtk
From: kurtk@tekcae.CAX.TEK.COM (Kurt Krueger)
Newsgroups: comp.lang.fortran
Subject: Re: CDC FORTRAN trivia questions
Keywords: arithmetic if logical
Message-ID: <2183@tekcae.CAX.TEK.COM>
Date: 3 Nov 88 20:45:12 GMT
References: <1196@helios.ee.lbl.gov> <3616@s.cc.purdue.edu> <7523@ut-emx.UUCP> <3622@s.cc.purdue.edu> <7693@boring.cwi.nl> <3627@s.cc.purdue.edu>
Reply-To: kurtk@tekcae.CAX.TEK.COM (Kurt Krueger)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 8

Something that may be confusing the issue is that CDC in the FTN and FTN5
compilers always inserted code to make sure that -0 would 'disappear'.
In logical statements, this would at times amount to adding a +0 to the
logical expression so SOME mathematics would always get done BEFORE a sign
test was done.  The hardware is such that -0 can NEVER get calculated
but is a perfectly legitimate operand.

-- I too like the Cybers.  Even the new NOS/VE ones - a REAL computer.