A-LevelComputer ScienceProgramming Constructs & Data TypesOct/Nov 2024Paper 2 Q29 Marks
A program is being developed to process bank card information. When a card number is displayed, all the characters except the last four are replaced with the asterisk character '*'. Card numbers are stored as strings. The strings are between 10 and 20 characters in length. The function Conceal() will take a string representing a card number and return a modified string. Example strings: | Original string | Modified string | |------------------------|------------------------| | "1234567890" | "******7890" | | "1234567897652" | "*********7652" | | "1234567890123456" | "************3456" |
📋 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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