Guess the number within a range

examples.exs

  defp midpoint a,b do div(a+b,2) end
  def guess(my_choice, a.._) when my_choice == a do IO.puts "is it #{a}?" end
  def guess(my_choice, _..b) when my_choice == b do IO.puts "is it #{b}?" end
  def guess(my_choice, a.._) when my_choice < a do IO.puts "out of range" end
  def guess(my_choice, _..b) when my_choice > b do IO.puts "out of range" end
  def guess(my_choice, a..b) when my_choice > div((a+b),2) do
    IO.puts "is it #{midpoint(a,b)}?"
    guess my_choice, midpoint(a,b)..b
  end
  def guess(my_choice, a..b) when my_choice < div((a+b),2) do
    IO.puts "is it #{midpoint(a,b)}?"
    guess my_choice, a..midpoint(a,b)
  end
  def guess(my_choice, a..b) when my_choice == div((a+b),2) do
    IO.puts "i got it. it is #{midpoint(a,b)}"
  end