Can anyone explain the $#kbin notation in the loop below. When I assign a scalar a string and print scalar with inserted # I get -1

 $ans = 1;
#     $kbin = split(/./,unpack('B*',pack('H*',$k)));
#        for ($i=0; $i<$#kbin; i++)
#        {
#                $ans = $ans * $ans % $N;
#                if (substr($kbin,$i,$1) == 1) { $ans = $ans * $M % $N
+; }
#        }

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In reply to strange syntax by grasshopper!!!

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