When you send a file to be printed on a shared printer, it is put onto a print queue with other jobs. Anytime before your job prints, you can access the queue to remove it. Thus, some queues support a...

When you send a file to be printed on a shared printer, it is put onto a print queue with other jobs. Anytime before your job prints, you can access the queue to remove it. Thus, some queues support a remove operation. Add this method to the queue implementations. The method should expect an integer index as an argument. It should then remove and return the item in the queue at that position (counting from position 0 at the front to position n – 1 at the rear).