binary-search.rb

puts "Min?"; @minimum = gets.chomp.to_i; @base = @minimum
puts "Max?"; @maximum = gets.chomp.to_i; @guesses = 0

def search(min, max)
  guess = min + (max - min) / 2
  puts guess
  answer(min, max, guess)
end

def answer(min, max, guess)
  ans = gets.chomp
  if ans == "yes"
    @guesses += 1
    puts "Nice! Took #{@guesses} guesses!"
  elsif ans == "tl"
    min = guess
    @guesses += 1
    search(min, max)
  elsif ans == "th"
    max = guess
    @guesses += 1
    search(min, max)
  end
end

search(@minimum, @maximum)