CTFL_UK Question #183: Real Exam Question with Answer & Explanation

The correct answer is C. 3. The three decisions are in sequence and the conditions are all mutually exclusive (if any one is true the others must be false). Hence a test case that makes the first decision true will make the second and third decisions false and so on. So test case 1 (say Time = 6) would exer

Question

Consider the following pseudo code: 1 Begin 2 Read Time 3 If Time < 12 Then 4 Print(Time, "am") 5 Endif 6 If Time > 12 Then 7 Print(Time 12, "pm") 8 Endif 9 If Time = 12 Then 10 Print (Time, "noon") 11 Endif 12 End How many test cases are needed to achieve 100 per cent decision coverage?

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Explanation

The three decisions are in sequence and the conditions are all mutually exclusive (if any one is true the others must be false). Hence a test case that makes the first decision true will make the second and third decisions false and so on. So test case 1 (say Time = 6) would exercise the path True, False, False, test case 2 (say Time = 15) would exercise the path False, True, False. Test case 3 would have to be Time = 12. This combination achieves 100 per cent decision coverage because each decision has been exercised through its true and its false outcomes.

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