++ a good and easy example, and a good use of & in string context,

we must note that we have a bit more then half the possible results we could get with a 12 digit solution. (first digit will be 0..5)
also, we must note that we require 64 bit algebra.

iff we have 64 bit algebra, we could return a modulo, there is some more population on lower buckets but it's less then 0.1%, on the other hand we would have about the double of bucket, giving the OP less risks of clashing.

without 64 bit algebra, things get a little more complex: 

my $md5 = ...;

my $lo = 0;
my $hi = 0;
for(split //, $md5)
{
        $lo = $lo*256 + ord;
        $hi = $hi*256 + $lo / 1_000_000;
        $lo = $lo % 1_000_000;
        $hi = $hi % 1_000_000;
}
return $hi.$lo;

[download]

In reply to Re^2: Digest (checksum) Algorithm for 12 Decimal Digits? (32bit) by oha
in thread Digest (checksum) Algorithm for 12 Decimal Digits? by cmv

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