Algorithm::CheckDigits::MBase_003(3pm) User Contributed Perl Documentation Algorithm::CheckDigits::MBase_003(3pm)

# NAME¶

CheckDigits::MBase_003 - compute check digits for SICI (Serial Item and Contribution Identifier)

# SYNOPSIS¶

```  use Algorithm::CheckDigits;
\$sici = CheckDigits('sici');
if (\$sici->is_valid('0784-8679(20040308)6:<138>2.0.TX;2-H')) {
# do something
}
\$cn = \$sici->complete('0784-8679(20040308)6:<138>2.0.TX;2-');
# \$cn = '0784-8679(20040308)6:<138>2.0.TX;2-H'
\$cd = \$sici->checkdigit('0784-8679(20040308)6:<138>2.0.TX;2-H');
# \$cd = 'H'
\$bn = \$sici->basenumber('0784-8679(20040308)6:<138>2.0.TX;2-H');
# \$bn = '0784-8679(20040308)6:<138>2.0.TX;2-';
```

# DESCRIPTION¶

## ALGORITHM¶

0
In the string describing the number all letters (A-Z) are replaced with numbers 10-35 accordingly. All other non-numbers are replaced by 36.
1
Beginning right the numbers at all odd positions are added.
2
The sum from step 1 is multiplied by 3.
3
Beginning right the numbers at all even positions are added.
4
The sums from step 2 and 3 are added.
5
The sum from step 4 is taken modulo 37.
6
The checksum is 37 minus the sum from step 5 where numbers from 10 to 35 are represented by 'A' to 'Z' accordingly and 36 is represented by '#'.

## METHODS¶

Returns true only if the last letter is a valid check letter according to the algorithm given above.

Returns false otherwise,

The check letter for \$number is computed and appended the end of \$number.

Returns the complete number with check letter or ''.

Returns the basenumber of \$number if \$number has a valid check digit.

Return '' otherwise.

Returns the check letter of \$number if \$number has valid check digits.

Return '' otherwise.

None by default.

# AUTHOR¶

Mathias Weidner, "<mamawe@cpan.org>"