Provided by: libalgorithm-checkdigits-perl_0.50-1_all

#### 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.

EXPORT
None by default.

```

#### AUTHOR

```       Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

```

#### SEEALSO

```       perl, CheckDigits, www.pruefziffernberechnung.de.