my_queue = Queue.new()
puts "Is the queue empty? #{my_queue.is_empty}"

puts "enqueue 10"
my_queue.enqueue(10)
puts "Is the queue empty? #{my_queue.is_empty}"

puts "enqueue 20"
my_queue.enqueue(20)
puts "Is the queue empty? #{my_queue.is_empty}"

puts "enqueue 30"
my_queue.enqueue(30)
puts "Is the queue empty? #{my_queue.is_empty}"

puts "dequeue should return 10: #{my_queue.dequeue()}"
puts "Is the queue empty? #{my_queue.is_empty}"
puts "dequeue should return 20: #{my_queue.dequeue()}"
puts "Is the queue empty? #{my_queue.is_empty}"
puts "dequeue should return 30: #{my_queue.dequeue()}"
puts "Is the queue empty? #{my_queue.is_empty}"
my_queue.print()