From many@different people at many:different:times:
> Dear Terry,
> Your barcode generator is broken!
> If you try to create an ISBN/EAN-13/EAN-8 barcode, then entering 000...02312 it will come up as 000...02313 in the barcode.
> <...snip...>
The above is a Frequently Asked Question (FAQ) that I often receive,
usually off-list. My answer is always along the following lines, so
I'm replying here so that we can direct users to this reply in future:
000...02312 is not a valid barcode, unlike 000...02313. This is
because the final digit is a *mandatory* check digit that for any
valid number *must* be calculated from the preceding digits. The
barcode generator will always recalculate the check digit correctly -
in the case of 000...0732 the correct check digit is 3.
[ Aside: Unfortunately the above also constitutes a "Frequently
Questioned Answer" (FQA) as most users are not satisfied with being
unable to specify the complete content of the barcode! ]
Have fun,
Terry
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