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Date: Sun, 17 Apr 2011 09:17:37 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Newsgroups: comp.lang.ada
Subject: Re: Fun with C
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	<iocsnt$lt$1@speranza.aioe.org> <8762qdyk6y.fsf@ludovic-brenta.org>
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Date: 2011-04-17T09:17:37+02:00
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On 4/16/11 11:12 PM, Ludovic Brenta wrote:
> "Nasser M. Abbasi"<nma@12000.org>  writes:

>> $ gcc -Wall  t.c
>> $ ./a.out
>> R = 33554416
>
> So R = 2**25 - 16, the correct answer is -16, so the actual result is
> the correct one except for bit 24, which is 1 when it should be zero.
>
> Out of curiosity, is this actual result a predictable consequence of the
> language definition, or is it undefined behavior?

Why, it is the same in Ada.

with Ada.Text_IO; use Ada.Text_IO;
with Ada.Unchecked_Conversion;

procedure Conv is

     type UInt is mod 2**32;
     type Int is range -2**31 .. 2**31 -1;

     function To_UInt is new Ada.Unchecked_Conversion(Int, UInt);
     N: UInt := 128;
     I: Int := -2048;
     R : Int;
begin
     R := Int(To_UInt(I) / N);
     Put_Line ("R =" & Int'Image(R));
end;