Damm algorithm: Difference between revisions
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(add BQN) |
(→{{header|Ruby}}: modernized, shortened; end-less def, digits) |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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<lang ruby> |
<lang ruby>TABLE = [ |
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idx = 0 |
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for i in 0 .. nbr.length - 1 |
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a = nbr[i].to_i |
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return false if a == nil |
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idx = @table[idx][a] |
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end |
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idx == 0 |
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end |
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@table = Array.new [ |
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[0,3,1,7,5,9,8,6,4,2], [7,0,9,2,1,5,4,8,6,3], |
[0,3,1,7,5,9,8,6,4,2], [7,0,9,2,1,5,4,8,6,3], |
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[4,2,0,6,8,7,1,3,5,9], [1,7,5,0,9,8,3,4,2,6], |
[4,2,0,6,8,7,1,3,5,9], [1,7,5,0,9,8,3,4,2,6], |
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] |
] |
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def damm_valid?(n) = n.digits.reverse.inject(0){|idx, a| TABLE[idx][a] } == 0 |
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while true |
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print "Number to check: " |
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[5724, 5727, 112946].each{|n| puts "#{n}: #{damm_valid?(n) ? "" : "in"}valid"} |
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</lang> |
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puts "this number is valid!" |
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| ⚫ | |||
else |
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5727: invalid |
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112946: valid |
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end |
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</pre> |
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| ⚫ | |||
this number is valid! |
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Number to check: 5727 |
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this number is invalid! |
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Number to check: 112940 |
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this number is invalid! |
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Number to check: 112946 |
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this number is valid! |
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Number to check: 1321 |
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this number is valid!</pre> |
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=={{header|Rust}}== |
=={{header|Rust}}== |
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