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Date: Sun, 09 Jul 2006 23:29:10 +0100
From: Martin Dowie <martin.dowie@btopenworld.com>
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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: 2006-07-09T23:29:10+01:00
List-Id: <comp.lang.ada>

James Giles wrote:
> All the stuff I elided is interesting.  Many of the features are even
> good things for languages to have.  None of them were checks for
> undefined variables.
> 
> Given the Ada program fragment:
> 
>    COUNT, SUM   :   INTEGER;
> 
>    [... lots of code ...]
>    [... some paths through which assign to SUM ...]
>    [... and some don't ...]
> 
>    COUNT := SUM+1;  -- is SUM defined here or not?
> 
> 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.

That's not entirely true, the standard states Integer must include the 
range �2**15+1 .. +2**15�1 - thus (usually) leaving -2**15 as a possible 
'default uninitialized' value.

Implementations /may/ do something else (e.g. on 32-bit architectures 
providing 'Integer' with the range -2**31+1 .. 2**31-1) and this should 
be stated in their own documentation (as per Annex M of the Ada language 
standard).

Cheers
-- Martin