From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,a9b0810d3106d9b8
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news1.google.com!postnews.google.com!a11g2000pro.googlegroups.com!not-for-mail
From: KK6GM <mjsilva@scriptoriumdesigns.com>
Newsgroups: comp.lang.ada
Subject: Re: Fun with C
Date: Sat, 16 Apr 2011 23:26:14 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: 
 <54108d8d-4e7c-4901-bd5e-819d27720d48@a11g2000pro.googlegroups.com>
References: <27cf3992-4132-4483-9110-adc7a089cd4a@e8g2000vbz.googlegroups.com>
NNTP-Posting-Host: 71.137.110.174
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1303021574 10955 127.0.0.1 (17 Apr 2011 06:26:14
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sun, 17 Apr 2011 06:26:14 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: a11g2000pro.googlegroups.com; posting-host=71.137.110.174;
 posting-account=qZVz2QoAAAAN9WxYp-9jYb7jORc4Zqwt
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64;
 Trident/4.0; GTB6.6; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR
 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:18827
Date: 2011-04-16T23:26:14-07:00
List-Id: <comp.lang.ada>

On Apr 16, 10:02=A0am, "George P." <george.p...@gmail.com> wrote:
> Spend few days chasing bug in embedded C project which can drilled
> down to this. Consider the following program, and all reasonable men
> will expect the result to be negative. =A0Not in C, and it is not a
> compiler bug :-(
>
> And offcorse none of the three comilers I cheched did not bother to
> issue a warning at least..
>
> #include <stdio.h>
>
> int main()
> {
> =A0 =A0 =A0unsigned n =3D 128;
> =A0 =A0 =A0int i =3D -2048;
> =A0 =A0 =A0int r;
>
> =A0 =A0 =A0r =3D i / n;
>
> =A0 =A0 =A0printf("R =3D %d\n", r);
>
> =A0 =A0 =A0return 0;
>
>
>
> }- Hide quoted text -
>
> - Show quoted text -

Wow and wow.  I've been writing C all my adult life and I didn't
realize this could or would happen.  I would have said that the
unsigned would be promoted to signed.

I'm going to include this example in my push to use Ada in our next
project.