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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: The right way to handle this difference in Ada
Date: Thu, 22 Jul 2004 15:34:09 +0200
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Date: 2004-07-22T15:34:09+02:00
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On Thu, 22 Jul 2004 15:22:24 +0200, Eric Jacoboni wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> 2. Well, if c should be negative then probably:
>>
>>    type int_12_type is range -2**12..2**12-1;
>>    subtype unsigned_int_12_subtype is
>>       int_12_type range 0..int_12_type'Last;
>>
>>    a : unsigned_int_12_subtype := 1;
>>    b : unsigned_int_12_subtype := 2;
>>    c : int_12_type := a - b; -- yields -1
> 
> Perhaps i've not understood all the implications of the initial
> question but, imo, a signed int_n_type varies from -2**(n - 1) to
> +2**(n - 1) - 1, not from -2**n to +2**n - 1.

So let n=13 (:-))

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de