A-LevelComputer ScienceData StructuresMay/June 2025Paper 4 Q120 Marks
A program stores positive integers in a circular queue. The queue is stored as a global 1D array of 20 integers with the identifier Queue. Each index is initialised with the data -1 The global variable HeadPointer, initialised to -1, points to the first element in the queue. The global variable TailPointer, initialised to −1, points to the last element in the queue. The global variable NumberItems, initialised to 0, stores the number of items in the queue.
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