defmodule GuessingGame do
  def compare(secret_number, guess \\ :no_guess)
  def compare(_secret_number, :no_guess), do:  "Make a guess"
  def compare(secret_number, guess) when secret_number == guess, do:  "Correct"
  def compare(secret_number, guess) when abs(secret_number - guess) == 1, do:  "So close"
  def compare(secret_number, guess) when guess > secret_number, do:  "Too high"
  def compare(secret_number, guess) when guess < secret_number, do:  "Too low"
end