A-LevelComputer ScienceData Structures and ProgrammingMay/June 2025Paper 3 Q125 Marks
The pseudocode algorithm checks whether a location in a stock file StockList.dat is empty or not. The location is given by the user. If the location is empty, a suitable message is displayed, otherwise the item stored at that location is displayed. Complete this file-handling pseudocode algorithm. DECLARE Location : INTEGER DECLARE Item : STRING DECLARE Continue : BOOLEAN DECLARE Answer : CHAR Continue ← TRUE OPENFILE WHILE Continue OUTPUT "Enter a location between 1 and 500: " INPUT Location GETRECORD IF Item = "" THEN OUTPUT "This record is missing." ELSE OUTPUT "The item in stock is ", ENDIF OUTPUT "Another location (Y or N)?" INPUT Answer IF Answer <> 'Y' THEN Continue ← FALSE ENDIF ENDWHILE OUTPUT "End of program"
📋 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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