A-LevelComputer ScienceProgramming ConceptsMay/June 2025Paper 2 Q58 Marks
A module Parity() takes a string as a parameter. The parameter has the identifier BitString and it represents a binary value. The module will concatenate a single character to the end of BitString by applying one of the two rules: : '0' if Bitstring contains an even number of 1s : '1' if Bitstring contains an odd number of 1s. The modified value of BitString is then returned. For example: Parameter String returned Explanation "0010010110" "00100101100" there are an even number of 1s in the string passed to Parity() so a '0' is concatenated to the end of BitString "101010" "1010101" there are an odd number of 1s in the string passed to Parity() so a '1' is concatenated to the end of BitString Write pseudocode for the module Parity() Assume the parameter BitString can only contain the characters '0' and '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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