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Ingy döt Net 2024-10-16 18:07:41 -07:00
parent 81fd053722
commit 52a6ef48dd
10248 changed files with 63654 additions and 6775 deletions
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Task/Roman-numerals-Encode/Elixir/roman-numerals-encode-1.ex Normal file
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defmodule Roman_numeral do
def encode(0), do: ''
def encode(x) when x >= 1000, do: [?M | encode(x - 1000)]
def encode(x) when x >= 100, do: digit(div(x,100), ?C, ?D, ?M) ++ encode(rem(x,100))
def encode(x) when x >= 10, do: digit(div(x,10), ?X, ?L, ?C) ++ encode(rem(x,10))
def encode(x) when x >= 1, do: digit(x, ?I, ?V, ?X)
defp digit(1, x, _, _), do: [x]
defp digit(2, x, _, _), do: [x, x]
defp digit(3, x, _, _), do: [x, x, x]
defp digit(4, x, y, _), do: [x, y]
defp digit(5, _, y, _), do: [y]
defp digit(6, x, y, _), do: [y, x]
defp digit(7, x, y, _), do: [y, x, x]
defp digit(8, x, y, _), do: [y, x, x, x]
defp digit(9, x, _, z), do: [x, z]
end