2 An algorithm is expressed as follows:
• input 100 numbers, one at a time
• keep a total of all numbers input that have a value between 30 and 70 inclusive and
output this total after the last number has been input.
Outline, using stepwise refinement, the five steps for this algorithm which could be used to
produce pseudocode.
Do not use pseudocode statements in your answer.

Q: What topic does this question test?

This question tests Algorithm Design and Problem Solving in A-Level Computer Science (syllabus code 9618). It is worth 7 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Computer Science Oct/Nov 2023 examination, Paper 2 Variant 1 (9618_w23_qp_21.pdf).

Question

2 An algorithm is expressed as follows:
• input 100 numbers, one at a time
• keep a total of all numbers input that have a value between 30 and 70 inclusive and
output this total after the last number has been input.
Outline, using stepwise refinement, the five steps for this algorithm which could be used to
produce pseudocode.
Do not use pseudocode statements in your answer.

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