Full IGCSE (0478) | O Level Computer Science (2210) May/June 2024/23 Paper 2 | Solved paper

I explained how to approach the algorithm step-by-step by focusing on the sequence and values of different variables. We checked values one by one, updating variables like L (largest), S (smallest), and T (total) based on conditions. We calculated the average A by dividing the total by the limit. For clarity, I emphasized the importance of using meaningful identifiers like largest, smallest, total, and average instead of vague ones like L, S, T, and A.

We then moved to testing, distinguishing between normal, abnormal, and extreme data. I provided examples and clarified that extreme test data represents boundary values, ensuring the program handles edge cases like 1 and 80 inclusively.

Next, I discussed substring operations, demonstrating how to extract specific portions of a string, such as "Computer Science," using substring(full_text, X, Y), and converting the original string to uppercase. For file handling, I explained how to open, write to, and close a file while adhering to the proper syntax, ensuring marks for each step.

Lastly, in database queries, I explained selecting fields (model, year, and engines) from a table, applying conditions like engines greater than 1, and ordering results by year. I clarified the role of clauses like WHERE and ORDER BY to filter and sort data.

This process reinforces concepts like algorithm design, testing, string manipulation, file handling, and database queries, ensuring clarity and correctness in execution.

Any questions so far? 😊
comment below your queries.

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