21 lines
637 B
Plaintext
21 lines
637 B
Plaintext
function checkdigit(n)
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matrix = (
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(0, 3, 1, 7, 5, 9, 8, 6, 4, 2),
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(7, 0, 9, 2, 1, 5, 4, 8, 6, 3),
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(4, 2, 0, 6, 8, 7, 1, 3, 5, 9),
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(1, 7, 5, 0, 9, 8, 3, 4, 2, 6),
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(6, 1, 2, 3, 0, 4, 5, 9, 7, 8),
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(3, 6, 7, 4, 2, 0, 9, 5, 8, 1),
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(5, 8, 6, 9, 7, 2, 0, 1, 3, 4),
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(8, 9, 4, 5, 3, 6, 2, 0, 1, 7),
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(9, 4, 3, 8, 6, 1, 7, 2, 0, 5),
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(2, 5, 8, 1, 4, 3, 6, 7, 9, 0))
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row = 0
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for d in string(n)
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row = matrix[row + 1][d - '0' + 1]
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end
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return row
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end
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foreach(i -> println("$i validates as: ", checkdigit(string(i)) == 0), [5724, 5727, 112946])
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