O-LevelComputer ScienceAlgorithm design and problem-solving2210/22 · Oct/Nov 2020 · Q36 Marks

This pseudocode algorithm is used as a validation check. PRINT "Input a number from 1 to 5000" REPEAT INPUT Number IF Number < 1 OR Number > 5000 THEN PRINT "Invalid number, please try again" ENDIF UNTIL Number >= 1 AND Number <= 5000 PRINT Number, " is within the correct range"

Identify three different types of test data. For each type, give an example of the test data you would use to test this algorithm and state a reason for your choice of test.[6]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.

[6] One mark for each correct type of test and one mark for each correct accompanying example of test data and reason (max six) e.g.
• Extreme data • 5000 • to check it is accepted
• Normal data • 300 • To check it is accepted
• Abnormal data • 10000 • To check it is rejected

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Topic: Algorithm design and problem-solving, O-Level Computer Science (syllabus 2210). Structured question, 6 marks.
Source: O-Level Computer Science, Oct/Nov 2020 Paper 2 Variant 2, question 3.

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