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ISRO | ISRO CS 2015 | Question 35

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At a particular time of computation the value of a counting semaphore is 7. Then 20 P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is : (A) 42 (B) 2 (C) 7 (D) 12

Answer: (B)

Explanation: Value of a counting semaphore = 7 After 20 P operations value of semaphore = 7 – 20 = -13 After 15 V operations value of semaphore = -13 + 15 = 2 So, option (B) is correct.

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Last Updated : 04 Apr, 2018
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