iSQI CTFL_Syll_4.0 Exam - Topic 2 Question 47 Discussion

Actual exam question for iSQI's CTFL_Syll_4.0 exam

Question #: 47
Topic #: 2

Consider a program that computes the factorial of a number (n). From the specifications you know that:

* If n < 0, a message "Value out of range" must be issued.

* If 0 < n < 100, the program calculates the factorial and returns the number

* If 100 < n < 200 message "Value out of range" must be issued

Which of the following statements about the equivalence partitions is CORRECT?

DThe equivalence partitions cannot be determined for this question because factorial of numbers close to 200 will be very large

CThe requirements are not correct because the partitions are overlapping

BThe equivalence partitions cannot be determined for this question because the error message for two partitions is exactly same

AThere are 3 partitions - one for negative numbers, one for numbers up to 100 and the last one for numbers up to 200

Show Suggested Answer

Suggested Answer: C

Equivalence partitioning involves dividing input data into partitions that are treated the same by the system under test. The given specifications create overlapping partitions:

For n<0n < 0n<0, an error message 'Value out of range' is issued.

For 0<n<1000 < n < 1000<n<100, the factorial is calculated.

For 100<n<200100 < n < 200100<n<200, the same error message 'Value out of range' is issued.

However, the range between 0 and 100 is exclusive of 0 and 100, meaning that the partitions overlap and create ambiguity for the boundary values. Thus, the correct statement is that the requirements are not correct because the partitions are overlapping.

by Elin at Jan 23, 2026, 06:39 AM

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1 month ago

Okay, this looks like a classic question on partitioning the input domain. I'll need to identify the different ranges and think about how to test each one.

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