Algorithm::CheckDigits::MXX_006.3pm

Langue: en

Autres versions - même langue

Version: 2010-07-01 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

NAME

CheckDigits::MXX_006 - compute check digits with Verhoeff scheme

SYNOPSIS

```   use Algorithm::CheckDigits;

\$verhoeff = CheckDigits('verhoeff');

if (\$verhoeff->is_valid('14567894')) {
# do something
}

\$cn = \$verhoeff->complete('1456789');
# \$cn = '14567894'

\$cd = \$verhoeff->checkdigit('14567894');
# \$cd = '4'

\$bn = \$verhoeff->basenumber('14567894');
# \$bn = '1456789'

```

DESCRIPTION

ALGORITHM

1.
Right to left all digits are permutated according to a permutation table.
2.
The permutated digits are combined using a diA~Xder table. The first with the second, the result with the third, this result with the fourth and so on.
3.
The result of the last combination in the diA~Xder table is in such a way combined that the result is 0 (zero). The number used for this combination is the checksum.

For details look at the source.

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.

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.

None by default.