Alchemist Challenge #1

guessing_game.exs

defmodule GuessingGame do
  # guess between a low number and a high number - > guess the middle
  #tell the user the guess
  # if user say yes ->  game over
  # if bigger
  # if smaller
  # anything else

  # elixr allows for multiple definitions of the same functions
  def guess(a, b) when a > b do
    guess(b, a)
  end

  def guess(low, high) do
    name = IO.gets "Hi there, what's ur name? \n"
    case String.trim(name) do
      "saurav" -> IO.puts "WOW, that's the best name in the world"
      _ -> IO.puts "Welcome to Elixir #{name} :-)"
    end

    answer = IO.gets "Hmm... did you guess #{mid(low, high)} #{name} ? \n"
    case String.trim(answer) do
      "bigger" -> bigger(low, high)
      "smaller" -> smaller(low, high)
      "yes" -> "YESSSSS!"
      _ -> IO.puts ~s(Type "bigger", "smaller" or "yes")
            guess(low, high)
    end
  end

  def mid(low, high) do
    div low + high, 2
  end

  def bigger(low, high) do
    new_low = min high, mid(low, high)+1
    guess(new_low, high)
  end

  def smaller(low, high) do
    new_high = max low, mid(low, high)-1
    guess(low, new_high)
  end

end