A-LevelComputer ScienceProgram Design and StructureMay/June 2021Paper 2 Q213 Marks
Four program modules form part of a program for a library. A description of the relationship between the modules is summarised as follows: Module name | Description --- | --- UpdateLoan() | • Calls either LoanExtend() or LoanReturn() LoanExtend() | • Called with parameters LoanID and BookID | • Calls CheckReserve() to see whether the book has been reserved for another library user | • Returns TRUE if the loan has been extended, otherwise returns FALSE CheckReserve() | • Called with BookID | • Returns TRUE if the book has been reserved, otherwise returns FALSE LoanReturn() | • Called with parameters LoanID and BookID | • Returns a REAL (which is the value of the fine to be paid in the case of an overdue loan)
📋 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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