CheckDigits::MXX_005(3User Contributed Perl DocumentatiCheckDigits::MXX_005(3)NAME
CheckDigits::MXX_005 - compute check digits for ESR9 (CH)
SYNOPSIS
use Algorithm::CheckDigits;
$esr = CheckDigits('esr9');
if ($esr->is_valid('123456786')) {
# do something
}
$cn = $esr->complete('12345678');
# $cn = '123456786'
$cd = $esr->checkdigit('123456786');
# $cd = '6'
$bn = $esr->basenumber('123456786');
# $bn = '12345678'
DESCRIPTION
ALGORITHM
1. Digits are processed left to right. For the first digit applies the
balance is 0.
2. The new balance is taken from the balance table according to the
current balance (row) and the digit (column).
3. The check digit is the difference from the last balance to 10 taken
modulo 10.
METHODS
is_valid($number)
Returns true only if $number consists solely of numbers and the
last digit is a valid check digit according to the algorithm given
above.
Returns false otherwise,
complete($number)
The check digit for $number is computed and concatenated to the end
of $number.
Returns the complete number with check digit or '' if $number does
not consist solely of digits and spaces.
basenumber($number)
Returns the basenumber of $number if $number has a valid check
digit.
Return '' otherwise.
checkdigit($number)
Returns the checkdigit of $number if $number has a valid check
digit.
Return '' 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::MXX_005(3)