22 lines
656 B
Raku
22 lines
656 B
Raku
sub damm {
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my(@digits) = split '', @_[0];
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my @tbl =([< 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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);
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my $row = 0;
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for my $col (@digits) { $row = $tbl[$row][$col] }
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not $row
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}
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for (5724, 5727, 112946) {
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print "$_:\tChecksum digit @{[damm($_) ? '' : 'in']}correct.\n"
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}
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