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B2.2 Data structuresB2.2.3

Stack as a 'last in, first out' (LIFO) data structure

Explain the concept of a stack as a 'last in, first out' (LIFO) data structure

SL + HL≈ 50 minCommand term: ExplainPremium

In this lesson

  • Explaining LIFO behaviour and the operations push, pop, peek and isEmpty
  • Tracing a sequence of stack operations
  • Describing how a stack can be implemented and what overflow and underflow are
  • Explaining uses of stacks: function calls and recursion, undo, checking brackets, reversing

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What's inside

  1. LearnLast in, first out
  2. LearnStack operations
  3. CodeUsing a stack
  4. LabStack lab
  5. LearnImplementing a stack
  6. CodeA stack in an array of 3
  7. CheckTrace a stack
  8. LearnWhere stacks are used
  9. CheckQuick check
  10. ExamWorked exam answer
  11. ReviewMistakes examiners see
  12. Exam practiceExam-style questions

Ends with 4 exam-style questions worth 11 marks, with a self-marking markscheme.