O-LevelComputer ScienceAlgorithm design and problem-solving2210/22 · May/June 2025 · Q34 Marks

A range check is used to validate that the input temperature is an integer between –100 and 0, inclusive. Suggest suitable normal, abnormal, extreme and boundary test data to test if this validation check is working correctly. Normal test data Abnormal test data Extreme test data Boundary test data

A range check is used to validate that the input temperature is an integer between –100 and 0, inclusive. Suggest suitable normal, abnormal, extreme and boundary test data to test if this validation check is working correctly. Normal test data Abnormal test data Extreme test data Boundary test data[4]

Mark scheme

Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.

[1] One mark per correct piece of test data,
Normal test data: -50 (any integer value between 0 and -100, inclusive)
Abnormal test data: 50 (any value outside the range 0 and −100, inclusive, or any non-numeric input and non-integers
Extreme test data: 0 // -100
Boundary test data: 1 // 0 // -100 // -101

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Topic: Algorithm design and problem-solving, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source: O-Level Computer Science, May/June 2025 Paper 2 Variant 2, question 3.

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