A-LevelComputer ScienceData Structures (Stacks)Oct/Nov 2024Paper 2 Q37 Marks
A program uses a stack to hold up to 60 numeric values. The stack is implemented using two integer variables and a 1D array. The array is declared in pseudocode as shown: DECLARE ThisStack : ARRAY [1:60] OF REAL The stack operates as follows: • Global variable SP acts as a stack pointer that points to the next available stack location. The value of SP represents an array index. • Global variable OnStack represents the number of values currently on the stack. • The stack grows upwards from array element index 1.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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