infinite for-loop and related question

[Jonathan Wakely]

On 16 February 2011 23:02, Thomas Martitz  wrote:
> Am 16.02.2011 22:49, schrieb Jonathan Wakely:
>>
>> On 16 February 2011 21:37, 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
>>>
>>> which is what I would expect. That is, i is a (signed) char, and when it
>>> goes over 127 it becomes a negative number, so the loop terminates.
>>
>> That would be the expected result if char was unsigned.
>
> Not exactly, no? An unsiged char goes to 255.
>
> Best regards.
>

Well yeah, of course. But the value goes to zero and the loop terminates.