A-LevelComputer ScienceData StructuresMay/June 2023Paper 2 Q311 Marks
A program processes data using a stack. The data is copied to a text file before the program ends. (a) The following diagram shows the current state of the stack. The operation of this stack may be summarised as follows: • The TopOfStack pointer points to the last item added to the stack. • The BottomOfStack pointer points to the first item on the stack. • The stack grows upwards when items are added. Stack | Memory location | Value | Pointer | |:---|:---:|:---:| | 506 | | | | 505 | WWW | ← TopOfStack | | 504 | YYY | | | 503 | XXX | | | 502 | ZZZ | | | 501 | NNN | | | 500 | PPP | ← BottomOfStack |
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