Topic study hub
Stacks
Official AQA 7517 section 4.2.3.
0
Objectives
5
Flashcards
7
Questions
36 min
Study time
AqaA LevelComputer ScienceFundamentals of data structures
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Syllabus checklist
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Stacks1 objectives
- Stacks: Be able to describe and apply the following operations: • push • pop • peek or top • test for empty stack • test for stack full. Peek or top returns the value of the top element without removing it.
Key terms
StackPeek/top
Exam tips
- Track the top after every operation: When tracing a sequence, record the stack from bottom to top after each push and pop, and do not alter it after a peek.
Common mistakes
- Confusing peek with pop: Remember that peek, or top, only returns the top value; pop returns the value and removes it.
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