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ISBN13 check digit: Difference between revisions
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→{{header|REXX}}: added zkl header
Langurmonkey (talk | contribs) (→{{header|langur}}: instead of just checking length of string, use regex for more thorough check) |
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ISBN-13 code 9781788399081 is valid.
ISBN-13 code 9781788399083 isn't valid.
</pre>
=={{header|zkl}}==
<lang zkl></lang>
<lang zkl></lang>
{{out}}
<pre>
</pre>
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