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Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M11_015

Algorithm-CheckDigits-v1.3.2.tar.gz

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Module Version: v1.3.2

# NAME

CheckDigits::M11_015 - compute check digits for ESR5 (CH)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$ustid = CheckDigits('esr5_ch');

if (\$ustid->is_valid('050001000012000 241170032660178 10304')) {
# do something
}

\$cn = \$ustid->complete('0001000012000 241170032660178 10304');
# \$cn = '050001000012000 241170032660178 10304'

\$cd = \$ustid->checkdigit('0001000012000 241170032660178 10304');
# \$cd = '05'

\$bn = \$ustid->basenumber('050001000012000 241170032660178 10304');
# \$bn = '0001000012000 241170032660178 10304';```

# DESCRIPTION

## ALGORITHM

1. Beginning right all digits are weighted with the repeating sequence 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. If the difference is 11, the checkdigit is 00.

## METHODS

is_valid(\$number)

Returns true only if `\$number` consists solely of numbers (with or without space between them) and the first two digits are valid check digits according to the algorithm given above.

Returns false otherwise,

complete(\$number)

The check digit for `\$number` is computed and inserted before the `\$number`.

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