Re: Re: Re: (Golf) Kaprekar's Process

[srawls]

Oh, I see: 100 - 001 is 99; 99 - 99 is zero. Now we've got an infinite loop. Just out of curiosity, how would you solve that? Your solution gives 6 (which is most likely right), I just don't see how.

The 15 year old, freshman programmer,
Stephen Rawls

[MeowChow]

That's what the sprintf is there for. It formats a two-digit result into a three-digit string, eg. 099. After sorting and reversal, you get 990 - 099.

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

[srawls]

Ok, I get it. I can modify yours than, and improve it by two chars:

sub a {
$_=pop;s/^..$/0$&/;/495/?0:1+a(-($_=join'',sort/./g)+reverse)
}

The 15 year old, freshman programmer,
Stephen Rawls