xcalc.exs

number_one = IO.gets "Please provide the first number: "
number_two = IO.gets "Please provide the second number: "
operation = IO.gets "Inform which operation you would like to do (+, -, *, /): "

number_one = number_one |> String.slice(0..-2) |> String.to_integer
number_two = number_two |> String.slice(0..-2) |> String.to_integer
operation = operation |> String.slice(0..-2)

# IO.puts number_one
# IO.puts number_two
# IO.puts operation

result = case operation do
  "+" ->
    number_one + number_two
  "-" ->
    number_one - number_two
  "*" ->
    number_one * number_two
  "/" ->
    number_one / number_two
  _ ->
    "Unsupported operand!"
end

IO.puts result