From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20664 invoked by alias); 17 Feb 2011 11:37:00 -0000 Received: (qmail 20435 invoked by uid 22791); 17 Feb 2011 11:36:59 -0000 X-SWARE-Spam-Status: No, hits=-2.3 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: sourceware.org Received: from mail-iy0-f175.google.com (HELO mail-iy0-f175.google.com) (209.85.210.175) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 17 Feb 2011 11:36:55 +0000 Received: by iyj8 with SMTP id 8so2326571iyj.20 for ; Thu, 17 Feb 2011 03:36:53 -0800 (PST) MIME-Version: 1.0 Received: by 10.42.179.67 with SMTP id bp3mr2608623icb.57.1297942613636; Thu, 17 Feb 2011 03:36:53 -0800 (PST) Received: by 10.42.230.68 with HTTP; Thu, 17 Feb 2011 03:36:53 -0800 (PST) In-Reply-To: <20110217094436.GQ5274@axel> References: <4D5C437F.5080207@cds1.net> <20110217094436.GQ5274@axel> Date: Thu, 17 Feb 2011 12:23:00 -0000 Message-ID: Subject: Re: infinite for-loop and related question From: Jonathan Wakely To: gcc-help@gcc.gnu.org Cc: Axel Freyn Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-IsSubscribed: yes Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-help-owner@gcc.gnu.org X-SW-Source: 2011-02/txt/msg00256.txt.bz2 On 17 February 2011 09:44, Axel Freyn wrote: > On Wed, Feb 16, 2011 at 01:37:03PM -0800, Bob Plantz wrote: >> On 02/16/2011 12:41 PM, Jason Mancini wrote: >>> Though I still find the output of this odd: >>> >>> =A0 =A0for (char i(1); i>0; ++i) >>> =A0 =A0 =A0printf("%d %d\n", i, sizeof(i)); >>> >>> ... >>> 362195 1 >>> 362196 1 >>> 362197 1 >>> ... >>> >>> For very large values of char! =A0^_^ >>> >>> Jason >> That's odd. With g++ 4.4.5 on an x86-64 machine in 64-bit mode I get: >> >> --- >> 125 1 >> 126 1 >> 127 1 > But there is also a second "bug" in the program. You tell "printf", that > the variable "i" is a integer and not a char -- so printf will read > sizeof(int) Bytes at the adress of "i" in order to create the > output-number, which gives you the 362195. =A0You should write something > like > =A0 =A0 =A0printf("%d %d\n", (int)i, sizeof(i)); > in order to get the "true" value of i in the output -- then I would > expect values in the "char"-range -127