Mathias Weidner > Algorithm-CheckDigits-v1.3.0 > Algorithm::CheckDigits::M11_016

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Module Version: 0.53   Source   Latest Release: Algorithm-CheckDigits-v1.3.2

# NAME

CheckDigits::M11_016 - compute check digits vor VAT Registration Number (PL)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$nip = CheckDigits('nip');

if (\$nip->is_valid('8567346215')) {
# do something
}

\$cn = \$nip->complete('856734621');
# \$cn = '8567346215'

\$cd = \$nip->checkdigit('856734621');
# \$cd = '5'

\$bn = \$nip->basenumber('8567346215');
# \$bn = '856734621';```

# DESCRIPTION

## ALGORITHM

1. Beginning left every digit is weighted with 6, 5, 7, 2, 3, 4, 5, 6, 7
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. Is the difference 10, the number won't be taken. If the difference is 11, the checkdigit is 0.

## METHODS

is_valid(\$number)

Returns true only if `\$number` consists solely of numbers and the rightmost 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 appended to the end of `\$number`.

Returns the complete number with check digit or '' if `\$number` does not consist solely of digits, hyphens and spaces.

basenumber(\$number)

Returns the basenumber of `\$number` if `\$number` has a valid check digit.

Return '' otherwise.

checkdigit(\$number)

Returns the check digits of `\$number` if `\$number` has valid check digits.

Return '' otherwise.

None by default.

# AUTHOR

Mathias Weidner, `<mamawe@cpan.org>`