1Algorithm::CheckDigits:U:sMe1r1_C0o1n3t(r3i)buted Perl DAolcguomreintthamt:i:oCnheckDigits::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;
11
12         $ustid = CheckDigits('ustid_gr');
13
14         if ($ustid->is_valid('123456783')) {
15               # do something
16         }
17
18         $cn = $ustid->complete('12345678');
19         # $cn = '123456783'
20
21         $cd = $ustid->checkdigit('123456783');
22         # $cd = '3'
23
24         $bn = $ustid->basenumber('123456783');
25         # $bn = '12345678';
26

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.
32
33       2.  The weighted digits are added.
34
35       3.  The sum from step 2 is taken modulo 11.
36
37       4.  If the sum from step 3 is greater than 9, the check sum is 0 else
38           it is the sum itself.
39
40   METHODS
41       is_valid($number)
42           Returns true only if $number consists solely of numbers and the
43           rightmost digit is a valid check digit according to the algorithm
44           given above.
45
46           Returns false otherwise,
47
48       complete($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 $number does
53           not consist solely of digits.
54
55       basenumber($number)
56           Returns the basenumber of $number if $number has a valid check
57           digit.
58
59           Return '' otherwise.
60
61       checkdigit($number)
62           Returns the check digits of $number if $number has valid check
63           digits.
64
65           Return '' otherwise.
66
67   EXPORT
68       None by default.
69

AUTHOR

71       Mathias Weidner, "<mamawe@cpan.org>"
72

SEE ALSO

74       perl, CheckDigits, www.pruefziffernberechnung.de,
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78perl v5.32.1                      2021-01-26Algorithm::CheckDigits::M11_013(3)
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