pretty cool, 2 comments:
  1. you should try to get this working with -w/strict
  2. you seem to have some "carry" problems... 
    $a = '99999999999999999999999999999999999';
$b = '1';
print "  $a\n+ $b\n= ", add($a, $b);

    [download]

    Gives... 

      99999999999999999999999999999999999
+ 1
= 00000000000000000000000000000000000

    [download]
(perhaps #1 would help to solve #2 ?)

In reply to Re: oldschool math by hossman
in thread oldschool math by Anonymous Monk

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