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Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M10_010

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Module Version: v1.3.2

# NAME

CheckDigits::M10_010 - compute check digits for Postscheckkonti (CH)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$pck = CheckDigits('postcheckkonti');

if (\$pck->is_valid('85-12345678-7')) {
# do something
}

\$cn = \$pck->complete('85-12345678');
# \$cn = '85-12345678-7'

\$cd = \$pck->checkdigit('85-12345678-7');
# \$cd = '7'

\$bn = \$pck->basenumber('85-12345678-7');
# \$bn = '85-12345678'```

# DESCRIPTION

## ALGORITHM

1. The sequence of digits is processed left to right. For the first digit we assume a carry forward of 0.
2. For each digit d(i) the carry forward cf(i) is the digit at the the position p in the sequence ( 0, 9, 4, 6, 8, 2, 7, 1, 3, 5 ), where p is (d(i) + cf(i-1)) modulo 10.
3. The check digit is the difference of the sum from step 3 to the next multiple of 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>`