Mathias Weidner > Algorithm-CheckDigits-v1.2.1 > Algorithm::CheckDigits::MBase_002

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Module Version: v1.1.2   Source   Latest Release: Algorithm-CheckDigits-v1.3.0

# NAME

CheckDigits::MBase_002 - compute check digits for blood bags (DE), BZÜ (DE), VAT Registration Number (DE)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$bb = CheckDigits('blutbeutel');

if (\$bb->is_valid('2761011234567893')) {
# do something
}

\$cn = \$bb->complete('276101123456789');
# \$cn = '2761011234567893'

\$cd = \$bb->checkdigit('2761011234567893');
# \$cd = '3'

\$bn = \$bb->basenumber('2761011234567893');
# \$bn = '276101123456789';```

# DESCRIPTION

## ALGORITHM

1. Start with values P = 10, S = 0.
2. Beginning left you do the following for all digits
1. S = (P + digit) modulo 10
2. If S is 0 then S = 10.
3. P = (2 * S) modulo 11
3. The check digit is (11 - P) modulo 10.

## 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>`

# SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de, www.eurocode.org.

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