CheckDigits::M16_001 - compute check digits for ISAN
use Algorithm::CheckDigits; $isan = CheckDigits('isan'); if ($isan->is_valid('123A567B8912E01A')) { # do something } $cn = $isan->complete('123A567B8912E01'); # $cn = '123A567B8912E01A' $cd = $isan->checkdigit('123A567B8912E01A'); # $cd = '4' $bn = $isan->basenumber('123A567B8912E01A'); # $bn = '123A567B8912E01'
a(1) = 16
b(i) = a(i) % 17 +d(i), where d(i) is the decimal value of the hexdigit at position i.
b(i) = a(i) % 17 +d(i)
d(i)
c(i) = b(i) % 16
a(i) = c(i-1) * 2, for i greater than 1
a(i) = c(i-1) * 2
Beginning left for each i = 1..16, a, b, c are computed.
a
b
c
The check digit is the value for d(16) where c(16) equals 1.
d(16)
c(16)
The check digit is appended as hexadecimal value to the 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.
$number
Returns false otherwise,
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.
Returns the basenumber of $number if $number has a valid check digit.
Return '' otherwise.
Returns the checkdigit of $number if $number has a valid check digit.
None by default.
Mathias Weidner, <mamawe@cpan.org>
<mamawe@cpan.org>
perl, CheckDigits, www.pruefziffernberechnung.de.
To install Algorithm::CheckDigits, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Algorithm::CheckDigits
CPAN shell
perl -MCPAN -e shell install Algorithm::CheckDigits
For more information on module installation, please visit the detailed CPAN module installation guide.