1CheckDigits::M11_013(3)User Contributed Perl DocumentatioCnheckDigits::M11_013(3)
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NAME

6       CheckDigits::M11_013 - compute check digits for VAT Registration Number
7       (GR)
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SYNOPSIS

10         use Algorithm::CheckDigits;
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12         $ustid = CheckDigits('ustid_gr');
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14         if ($ustid->is_valid('123456783')) {
15               # do something
16         }
17
18         $cn = $ustid->complete('12345678');
19         # $cn = '123456783'
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21         $cd = $ustid->checkdigit('123456783');
22         # $cd = '3'
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24         $bn = $ustid->basenumber('123456783');
25         # $bn = '12345678';
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DESCRIPTION

28   ALGORITHM
29       1.  Beginning right with the digit before the checkdigit all digits are
30           weighted with 2 ** position. I. e. the last digit is multiplied
31           with 2, the next with 4, then 8 and so on.
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33       2.  The weighted digits are added.
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35       3.  The sum from step 2 is taken modulo 11.
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37       4.  If the sum from step 3 is greater than 9, the check sum is 0 else
38           it is the sum itself.
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40   METHODS
41       is_valid($number)
42           Returns true only if $number consists solely of numbers and the
43           rightmost digit is a valid check digit according to the algorithm
44           given above.
45
46           Returns false otherwise,
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48       complete($number)
49           The check digit for $number is computed and appended to the end of
50           $number.
51
52           Returns the complete number with check digit or '' if $number does
53           not consist solely of digits.
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55       basenumber($number)
56           Returns the basenumber of $number if $number has a valid check
57           digit.
58
59           Return '' otherwise.
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61       checkdigit($number)
62           Returns the check digits of $number if $number has valid check
63           digits.
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65           Return '' otherwise.
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67   EXPORT
68       None by default.
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AUTHOR

71       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
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SEE ALSO

74       perl, CheckDigits, www.pruefziffernberechnung.de,
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78perl v5.12.1                      2009-11-20           CheckDigits::M11_013(3)