3. Show the contents of the queue, from front to back, after the execution of the following segment of code, given that queue is an object that fits an abstract description of a queue (originally empty). Assume that you can store and retrieve variables of type int on queue. (Note: also discuss your work in terms of how you got your answer.)

queue.enqueue(15); queue.dequeue(); queue.enqueue(0); queue.enqueue(20);

queue.dequeue(); queue.enqueue(10);

queue.enqueue(queue.dequeue());

for (int i = 1; i <= 3; i++) queue.enqueue (i + 3);

queue.dequeue();