That's odd...I tried running this on my system. First I just did the map statement, and assigned 123 to x. This worked perfectly. So, I got a little confused as to why it worked for me, and not for you, so I tried to run the whole script. However--and this is quite a big however--it resulted in an infinite loop, printing out large, negative numbers on my machine. Is this the exact code?
Re: Re: (Golf) Kaprekar's Process
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Oh, it loops indefinately, all right. I ran it | head. And yes, that is the exact code.
If you grab the top of the output, do the see the odd value of @_ = 312321,123312? I would think that @_ would contain the same value as the output from c() since it uses the same map statement (- the pop). But I can't shake the feeling I'm missing something simple here (as I often do) :)
Btw, I split the subroutine up into individual statements for debugging. It used many fewer temporary variables at first.