Last Change: 2018-09-07, 16:50
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CheckDigits::M11_009 - compute check digits NRIC (SG)
use Algorithm::CheckDigits;
$nric = CheckDigits('nric_sg');
if ($nric->is_valid('S1234567D')) {
# do something
}
$cn = $nric->complete('S1234567');
# $cn = 'S1234567D'
$cd = $nric->checkdigit('S1234567D');
# $cd = 'D'
$bn = $nric->basenumber('S1234567D');
# $bn = 'S1234567';
ALGORITHM
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1. |
Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2 |
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2. |
The weighted digits are added. |
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3. |
The sum from step 2 is taken modulo 11. |
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4. |
The checkdigit is 11 minus the sum from step 3 converted to a character according to the following table: |
@cd = ('','A','B','C','D','E','F','G','H','I','Z','J', );
METHODS
is_valid($number)
Returns true only if $number consists of seven digits (optional preceded by a letter out of ’F’, ’G’, ’S’, ’T’) followed by a valid letter according to the algorithm given above.
Returns false otherwise,
complete($number)
The check letter for $number is computed and appended to the end of $number.
Returns the complete number with check digit or ’’ if $number does not consist solely of digits and letters.
basenumber($number)
Returns the basenumber of $number if $number has a valid check digit.
Return ’’ otherwise.
checkdigit($number)
Returns ’’ if $number is valid.
Return undef otherwise.
EXPORT
None by default.
Mathias Weidner, "<mamawe AT cpan DOT org>"
perl, CheckDigits, www.pruefziffernberechnung.de,