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A-LevelComputer ScienceString ManipulationMay/June 2024Paper 2 Q69 Marks

A program displays a progress bar to inform the user of the progress of tasks that take a significant time to complete, such as those involving file transfer operations. Task progress is divided into 11 steps. Each step represents the amount of progress as a percentage. An image is associated with each step and each image is stored in a different file. Different progress bar images may be selected. For a given image, files all have the same filename root, with a different suffix. The table illustrates the process for using the image with filename root BargraphA Step | Percentage progress | Image filename | Image ---|---|---|--- 1 | < 10 | BargraphA-1.bmp | 2 | >= 10 and < 20 | BargraphA-2.bmp | 3 | >= 20 and < 30 | BargraphA-3.bmp | ... | ... | ... | ... 9 | >= 80 and < 90 | BargraphA-9.bmp | 10 | >= 90 and < 100 | BargraphA-10.bmp | 11 | 100 | BargraphA-11.bmp | A procedure Progress() will: • be called with two parameters: ο an integer representing the percentage progress (0 to 100 inclusive) ο a string representing the image filename root • generate the full image filename • call a procedure Display() using the full image filename as the parameter.

📋 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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About This A-Level Computer Science Question

Topic

This structured question tests String Manipulation in A-Level Computer Science (syllabus code 9618). It is worth 9 marks.

Source

This question appeared in the Cambridge A-Level Computer Science May/June 2024 examination, Paper 2 Variant 3.

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