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Welcome to the Even Odd in Elixir page! Here, you'll find the source code for this program as well as a description of how the program works.
defmodule EvenOdd do
require Integer
@doc """
Determine whether a supplied number is Even or Odd.
Return an error-string if the argument is missing or invalid.
"""
@spec main(argv :: list( String.t())) :: String.t()
def main(argv) do
if length(argv) != 1 do
"Usage: please input a number"
else
case argv |> List.first |> Integer.parse do
{number, ""} -> even_odd_string(number)
{_, _rest} -> "Usage: please input a number"
:error -> "Usage: please input a number"
end
end
end
@spec even_odd_string(number :: integer) :: String.t()
defp even_odd_string(number) do
case Integer.is_even(number) do
true -> "Even"
false -> "Odd"
end
end
end
EvenOdd.main(System.argv()) |> IO.puts
Even Odd in Elixir was written by:
If you see anything you'd like to change or update, please consider contributing.
Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 04 2020 23:28:49. The solution was first committed on Oct 03 2020 02:22:00. As a result, documentation below may be outdated.
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