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=unavailable autolearn_force=no version=3.4.4
X-Received: by 10.224.42.141 with SMTP id s13mr6473718qae.3.1369320085304;
 Thu, 23 May 2013 07:41:25 -0700 (PDT)
X-Received: by 10.50.112.105 with SMTP id ip9mr1437053igb.1.1369320085225;
 Thu, 23 May 2013 07:41:25 -0700 (PDT)
Path: 
 border1.nntp.dca3.giganews.com!border2.nntp.dca3.giganews.com!border4.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!news-out.readnews.com!transit3.readnews.com!209.85.216.88.MISMATCH!ch1no807003qab.0!news-out.google.com!y6ni51092qax.0!nntp.google.com!ch1no807002qab.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Thu, 23 May 2013 07:41:24 -0700 (PDT)
In-Reply-To: <96af9cd4-3368-4866-a38e-2514a0a7a54d@googlegroups.com>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com;
 posting-host=66.126.103.122;
 posting-account=duW0ogkAAABjRdnxgLGXDfna0Gc6XqmQ
NNTP-Posting-Host: 66.126.103.122
References: <7cd707ce-ebc5-4df1-9ec3-4f99ce87a07d@googlegroups.com>
 <96af9cd4-3368-4866-a38e-2514a0a7a54d@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <9d131b52-1fe8-4fcb-bb99-c034cefadeee@googlegroups.com>
Subject: Re: Simple loop with a strange output
From: Adam Beneschan <adam@irvine.com>
Injection-Date: Thu, 23 May 2013 14:41:25 +0000
Content-Type: text/plain; charset=ISO-8859-1
X-Original-Bytes: 2008
Xref: number.nntp.dca.giganews.com comp.lang.ada:181732
Date: 2013-05-23T07:41:24-07:00
List-Id: <comp.lang.ada>

On Thursday, May 23, 2013 7:37:24 AM UTC-7, Adam Beneschan wrote:
> On Thursday, May 23, 2013 6:53:19 AM UTC-7, Luca Cappelletti wrote:
 
> > do you know what's happening?
 
> Overflow.
> 
> The largest possible value of an "integer" type on this platform is (2**31)-1.  So when X hits 2**30 and then you double it, the actual value, 2**31, won't fit in an integer.  If you use the right flags when compiling (I don't remember what they are), 

OK, if you compile with -gnato, it will do the check, and now the program will die on a Constraint_Error instead of getting into an infinite loop.

                            -- Adam