Subj : Re: Reversing a number
To   : comp.programming
From : Irrwahn Grausewitz
Date : Mon Sep 12 2005 01:45 pm

"Rob Thorpe" <robert.thorpe@antenova.com> wrote:
>Willem wrote:
>> Roger wrote:
>> ) "Irrwahn Grausewitz" <irrwahn35@freenet.de> wrote in message
>> ) news:shv7i1p3on0qpsr2rumeifst69o8tjtp32@4ax.com...
>> )>     int n = 0;
>> )>
>> )>>    while (i)
>> )>>    {
>> )>>        n *= 10;
>> )>>        n += i % 10;
>> )>>        i /= 10;
>> )>>    }
>> )>>    return n;
>> )>>}
>> )
>> ) Then reverse(10000) is (1).

Correct.  After all, the reverse of 10000 _is_ 1.  The reverse of 
"10000" would be "00001", but that's reversing a string, not a number.

>> Of course it is; the function returns an integer, after all.
>
>I think the OP means a number in the mathematical sense of the word.
>ie:-
>
>1 -> 1
>21 -> 12
>5634 -> 4365

.... which is exactly what above code does.  Look Ma, no strings.

>As Jerry Quinn pointed out it's simplest to convert it to a string then
>reverse it and convert it back again.

Is it?

10000 --> "10000" --> "00001" --> 1

Great improvement.  :>

Best regards
-- 
Irrwahn 
(irrwahn35@freenet.de)

.