Difficulty: Hard

Average Score: 43%

An algorithm should output 'OK' if a number is between 98.3 and 98.9, else the output is 'Not OK.'

Which test is a valid test of the algorithm?

Rationale

Input 98.6. Ensure output is 'OK.'

The algorithm is designed to output 'OK' for numbers within the range of 98.3 to 98.9, inclusive. Since 98.6 falls within this specified range, the expected output is indeed 'OK'.

A (Input 99.9. Ensure output is '98.9.') YOUR ANSWER

This choice is invalid because the output should not be '98.9'; the input of 99.9 is outside the defined range, so the correct output should be 'Not OK.'

B (Input 99.9. Ensure output is 'OK.') YOUR ANSWER

This choice is incorrect because the number 99.9 exceeds the upper limit of the acceptable range (98.9). Therefore, the output for this input should be 'Not OK,' not 'OK.'

C (Input 98.6. Ensure output is 'OK.') CORRECT

This choice is valid as 98.6 is indeed within the range of 98.3 to 98.9. The algorithm correctly outputs 'OK' for this input, confirming its functionality.

D (Input 98.6. Ensure output is 'Not OK.') YOUR ANSWER

This choice is incorrect because it misinterprets the algorithm's logic. Since 98.6 falls within the acceptable range, the correct output should be 'OK,' not 'Not OK.'

Conclusion

The algorithm's design clearly specifies that it will output 'OK' for any number within the range of 98.3 to 98.9. Choice C correctly identifies a valid test of the algorithm, while the other choices either misrepresent the expected outputs or test values outside the specified range. Understanding these limits is crucial for validating the algorithm's performance effectively.

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