21 lines
678 B
Raku
21 lines
678 B
Raku
sub damm ( *@digits ) {
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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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my $row = 0;
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for @digits -> $col { $row = @tbl[$row][$col] }
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not $row
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}
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# Testing
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for 5724, 5727, 112946 {
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say "$_:\tChecksum digit { damm( $_.comb ) ?? '' !! 'in' }correct."
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}
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