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From: "robin" <robin_v@bigpond.com>
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Subject: Re: Ada vs Fortran for scientific applications
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Date: Wed, 12 Jul 2006 00:37:20 GMT
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Xref: g2news2.google.com comp.lang.ada:5630 comp.lang.fortran:11961
 comp.lang.pl1:1997
Date: 2006-07-12T00:37:20+00:00
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glen herrmannsfeldt wrote in message ...
>robin wrote:
>
>> glen herrmannsfeldt wrote in message <5rSdnTfTP7NHEyzZnZ2dnUVZ_tidnZ2d@comcast.com>...
>
>>>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.
But they are long-gone machines, as I said; some 20 + years.

> and as I understand it Univac still does.
>
>The last sign magnitude binary machine I know of is the 7090.

40+ years ago.

>S/360 and successors use sign magnitude for fixed point decimal
>arithmetic.

Off topic. We're referring to binary integers, not decimal

>  I don't know of any nines complement machines,

off topic.  They probably never existed.