A-LevelComputer ScienceProgrammingOct/Nov 2022Paper 2 Q710 Marks
A simple arithmetic expression is stored as a string in the format: <Value1><Operator><Value2> An operator character is one of the following: '+' '-' '*' '/' Example arithmetic expression strings: "803+1904" "34/7" (a) A procedure Calculate() will: • take an arithmetic expression string as a parameter • evaluate the expression • output the result. Assume: • the string contains only numeric digits and a single operator character • Value1 and Value2 represent integer values • Value1 and Value2 are unsigned (they will not be preceded by '+' or '-').
📋 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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