The answers to the Abstract Data Type (ADT) implementation practice I sent yesterday are at: http://cs.millersville.edu/~katz/cs162/examples/ADTpractice/ It printed okay for me on one page from Firefox. You can also just look at it on the web page. For the quiz, you need to be able to do stack with linked list and queue with array. The queue will probably need to resize. The front item will be at data[0] in the new array when you copy from the old array to the new.