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Date: Sun, 09 Jul 2006 16:19:25 -0700
From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
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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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Xref: g2news2.google.com comp.lang.ada:5587 comp.lang.fortran:11862
 comp.lang.pl1:1963
Date: 2006-07-09T16:19:25-07:00
List-Id: <comp.lang.ada>

James Giles wrote:

(snip)

> In most Ada implementations, as for most other languages, all
> the bit patterns in the representation of an INTEGER data type
> are valid integer values. 

For signed integer types, most, if not all, allow twos complement,
ones complement, or sign magnitude representation.  For representations
with two zeros, the use of a zero representation not generated by
the hardware is likely system dependent .

 > There is no bit pattern representing
> NOI (Not An Integer) corresponding to the IEEE float idea of
> a NAN. 

It might be that some hardware supports such a bit pattern.
It is also legal in most, if not all, languages for additional
bits to be in the representation that are not used for valid
values.  Even C allows that.

Fortran specifically allows for any base greater than one.
C pretty much only allows binary.

-- glen