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Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M10_009

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Module Version: v1.3.2

# NAME

CheckDigits::M10_009 - compute check digits for Betriebsnummer (DE)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$betrnr = CheckDigits('betriebsnummer');

if (\$betrnr->is_valid('73282932000074')) {
# do something
}

\$cn = \$betrnr->complete('7328293200007');
# \$cn = '73282932000074'

\$cd = \$betrnr->checkdigit('73282932000074');
# \$cd = '4'

\$bn = \$betrnr->basenumber('73282932000074');
# \$bn = '7328293200007'```

# DESCRIPTION

## ALGORITHM

1. Beginning left all numbers are weighted alternatively 1 and 2.
3. The sum of step 3 ist taken modulo 10.
4. The check digit is the difference between 10 and the number from step 3 taken modulo 10.

HINT: The last digit of the 'Betriebsnummer' may be the check digit or the last digit of the sum of the constant 5 and the check digit.

## 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.

None by default.

# AUTHOR

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