Mathias Weidner > Algorithm-CheckDigits-v1.2.1 > Algorithm::CheckDigits::M11_006

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

# NAME

CheckDigits::M11_006 - compute check digits for Código de Cuenta Corriente (ES)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$ccc = CheckDigits('ccc_es');

if (\$ccc->is_valid('2420-0730-27-0050103552')) {
# do something
}

\$cn = \$ccc->complete('2420-0730-  -0050103552');
# \$cn = '2420-0730-27-0050103552'

\$cd = \$ccc->checkdigit('2420-0730-27-0050103552');
# \$cd = '27'

\$bn = \$ccc->basenumber('2420-0730-27-0050103552');
# \$bn = '2420-0730-  -0050103552';```

# DESCRIPTION

## ALGORITHM

1. Beginning right all digits are weighted 6,3,7,9,10,5,8,4,2,1.
2. The weighted digits are added.
3. The sum of step 2 is taken modulo 11.
4. The checkdigit is 11 minus the sum from step 3.

If the difference is 10, the checkdigit is 1.

If the difference is 11, the checkdigit is 0.

## METHODS

is_valid(\$number)

Returns true only if `\$number` consists solely of numbers and hyphens and the two digits in the middle are valid check digits according to the algorithm given above.

Returns false otherwise,

complete(\$number)

The check digit for `\$number` is computed and inserted into the middle of `\$number`.

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