Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!cwjcc!ukma!rutgers!cs.utexas.edu!ut-emx!cccm001
From: cccm001@ut-emx.UUCP (Tom Linsley)
Newsgroups: comp.lang.fortran
Subject: Re: CDC FORTRAN trivia questions
Summary: Truth values - Dave's right
Keywords: arithmetic if logical
Message-ID: <7556@ut-emx.UUCP>
Date: 1 Nov 88 21:21:37 GMT
References: <1196@helios.ee.lbl.gov> <3616@s.cc.purdue.edu> <7523@ut-emx.UUCP> <3622@s.cc.purdue.edu>
Organization: The University of Texas at Austin, Austin, Texas
Lines: 25

By golly, Dave's right, the "logical truth" is even curiouser than I had
thought.  I ran a little "assign and print" program this afternoon using five
of the Fortran compilers on our Dual Cyber 170/750;  herewith the results:

 RUN         TRUE  77777777777777777777  (-0)
             FALSE 00000000000000000000  (+0)

 MNF 4.6     TRUE  77777777777777777776  (-1)
             FALSE 00000000000000000001  (+1)

 MNF 5.4     TRUE  77777777777777777776  (-1)
             FALSE 00000000000000000000  (+0)

 FTN 4.8     TRUE  77777777777777777776  (-1)
             FALSE 00000000000000000000  (+0)

 FTN 5.1     TRUE  77777777777777777776  (-1)
             FALSE 00000000000000000000  (+0)

 I sure hope none of Mike Helms' old CDC code relies on anything but just
 plain "true" or "false". - TL
--

Tom Linsley
University of Texas Computation Center
cccm001@emx.cc.utexas.edu