O-LevelComputer ScienceAlgorithm design and problem-solving2210/23 · Oct/Nov 2023 · Q88 Marks

This is an algorithm to find if a batch of parts has been manufactured successfully.

(a)Complete the trace table using this data: Y, Y, Y, N, Y, Y, Y, Y, N, Y, Y, Y, Y Accept Reject PartOK Error OUTPUT[5]
(b)Describe how the algorithm should be changed to accept 'Y' or 'y' for a successfully manufactured part.[3]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

[5] One mark for each column Accept: 0, 1, 2, 3, 3, 4, 5, 6, 7, 7, 8, 9, 10 Reject: 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2 PartOK: Y, Y, Y, N, Y, Y, Y, Y, N, Y, Y, Y, Y Error: --, --, --, --, --, --, --, --, --, --, --, --, 20 OUTPUT: --, --, --, --, --, --, --, --, --, --, --, --, Too many rejected 20% error
[3] One mark for each point max three after the Input box // before the first decision box insert a process box to convert the input to upper case OR change the first decision / add another decision box to accept 'y' as well by adding OR PartOK = 'y'

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Topic: Algorithm design and problem-solving, O-Level Computer Science (syllabus 2210). Structured question, 8 marks.
Source: O-Level Computer Science, Oct/Nov 2023 Paper 2 Variant 3, question 8.

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