-

number = rand(1...1000)

guess = ""

while guess != number
  print "Guess a number between 0 and 1000. "
  guess = Integer(gets) rescue nil
  if guess == nil || guess <= 0 || guess >= 1000
    puts "Invalid input, must enter a number between 0 and 1000."
    break
  elsif guess < number
    puts "Too low, try again."
  elsif guess > number
    puts "Too high, try again."
  else
    puts "Congratulations, you guessed the number!"
  end
end