From: Axel Freyn <axel-freyn@gmx.de>
To: gcc-help@gcc.gnu.org
Subject: Re: infinite for-loop and related question
Date: Thu, 17 Feb 2011 10:36:00 -0000 [thread overview]
Message-ID: <20110217094436.GQ5274@axel> (raw)
In-Reply-To: <4D5C437F.5080207@cds1.net>
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:
>>
>> for (char i(1); i>0; ++i)
>> printf("%d %d\n", i, sizeof(i));
>>
>> ...
>> 362195 1
>> 362196 1
>> 362197 1
>> ...
>>
>> For very large values of char! ^_^
>>
>> 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. You should write something
like
printf("%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<i<128.
Axel
next prev parent reply other threads:[~2011-02-17 9:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-16 20:17 Jason Mancini
2011-02-16 20:41 ` Jonathan Wakely
2011-02-16 21:37 ` Jason Mancini
2011-02-16 21:49 ` Bob Plantz
2011-02-16 23:00 ` Jonathan Wakely
2011-02-16 23:22 ` Thomas Martitz
2011-02-17 6:31 ` Jonathan Wakely
2011-02-17 10:36 ` Axel Freyn [this message]
2011-02-17 12:23 ` Jonathan Wakely
2011-02-17 13:16 ` Axel Freyn
2011-02-17 14:08 ` Jonathan Wakely
2011-02-16 23:00 Bill McEnaney
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