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Date: Thu, 13 Jul 2006 23:08:21 -0700
From: Bob Lidral <l1dralspamba1t@comcast.net>
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Newsgroups: comp.lang.ada,comp.lang.fortran,comp.lang.pl1
Subject: Re: Ada vs Fortran for scientific applications
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Date: 2006-07-13T23:08:21-07:00
List-Id: <comp.lang.ada>

Everett M. Greene wrote:
> "robin" <robin_v@bigpond.com> writes:
> 
>>glen herrmannsfeldt wrote in message ...
>>
>>>robin wrote:
>>>
>>>>glen herrmannsfeldt wrote
>>>
>>>>>For signed integer types, most, if not all, allow twos complement,
>>>>>ones complement, or sign magnitude representation.
>>>
>>>>Virtually all use twos complement for negative values.
>>>>Few ever used ones complement anyway.  They were a PITA.
>>>
>>>CDC used ones complement,
>>
>>Yes, and they were a PITA.
> 
> 
> In what regard?  Ones complement vs. twos complement is
> rarely of significance to a HLL programmer.
> 
Depends of the compiler, instruction set, and application.

Years ago, I did a lot of programming on CDC CYBERS.  There were some 
operations that could result in either positive or negative zero.  It 
was also difficult to do character comparisons.


Bob Lidral
lidral  at  alum  dot  mit  dot  edu