calculator3.ex

defmodule Calculator do
  def repl(acc \\ 0.0, i \\ 0, io \\ IO) do
    interpret(acc, i + 1, io) |> repl(i + 1, io)
  end

  def interpret(acc, i, io) do
    io.puts("accumulator> #{acc}")
    [command, value] = io.gets("operation(#{i})> ") |> String.trim() |> String.split()
    {value, _} = Float.parse(value) # Convert a string to its float representation
    run_command(acc, command, value)
  end

  defp run_command(acc, command, value) do
    case command do
      "=" -> value
      "+" -> acc + value
      "-" -> acc - value
      "*" -> acc * value
      "/" -> acc / value
    end
  end
end