CheckDigits::M11_009(3User Contributed Perl DocumentatiCheckDigits::M11_009(3)NAME
CheckDigits::M11_009 - compute check digits NRIC (SG)
SYNOPSIS
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');
# $bn = 'S1234567';
DESCRIPTION
ALGORITHM
1. Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2
2. The weighted digits are added.
3. The sum from step 2 is taken modulo 11.
4. The checkdigit is 11 minus the sum from step 3 converted to a
character according to the following table:
@cd = ('','A','B','C','D','E','F','G','H','I','Z','J', );
METHODS
is_valid($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.
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de,
perl v5.14.1 2009-11-20 CheckDigits::M11_009(3)
