ISBN13 check digit: Difference between revisions
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m (→{{header|Factor}}: mod zero? -> divisor?) |
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=={{header|Factor}}== |
=={{header|Factor}}== |
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<lang factor>USING: combinators.short-circuit formatting kernel math |
<lang factor>USING: combinators.short-circuit formatting kernel math |
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math.parser math.vectors qw sequences |
math.functions math.parser math.vectors qw sequences |
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unicode ; |
sequences.extras sets unicode ; |
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: (isbn13?) ( str -- ? ) |
: (isbn13?) ( str -- ? ) |
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string>digits |
string>digits |
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[ <evens> sum ] [ <odds> 3 v*n sum + ] bi 10 |
[ <evens> sum ] [ <odds> 3 v*n sum + ] bi 10 divisor? ; |
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: isbn13? ( str -- ? ) |
: isbn13? ( str -- ? ) |
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