UPC : Java Glossary
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UPC
Universal Pproduct Code, a 12 digit-product code used to identify retails products. It is usually printed as a bar code on the box or can. It is being replaced by the 13-digit EAN, which also handles ISBNs.

To convert a 12-digit UPC, prepend a 0.

The EAN-13 checkdigit is computed in an unusual way with mod 10 and weight 3. This means the 13-digit EAN numbers are always purely numeric. There is never an X checkdigit as there is sometimes with the mod-10, 10-digit ISBNs.

EAN
ISBN
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