Exam-style question
Try this first
Describe how add, remove, empty, and full operations apply to a circular queue. Explain how a circular queue can use space that was freed by removing items.
Model answer
What a good answer should say
- To add an item, the item is placed at the rear of the queue.
- If the rear reaches the end of the available storage area, it can wrap around to the beginning.
- To remove an item, the item at the front is removed and the front position moves forward, also wrapping around when necessary.
- An empty test checks whether the circular queue contains no items.
Explanation
Why this works
The essential feature of a circular queue is that the storage positions are treated as connected in a circle. This allows previously used positions to be reused, while empty and full tests prevent invalid remove and add operations.
Common mistake
No common mistake is linked to this question yet.