C Language | Set 10

Following questions have been asked in GATE CS 2014 exam.
1) Consider the following program in C language: 
 

Which one of the following statements is TRUE? 
(A) Compilation fails. 
(B) Execution results in a run-time error. 
(C) On execution, the value printed is 5 more than the address of variable i. 
(D) On execution, the value printed is 5 more than the integer value entered.
Answer: (D) 
Explanation: There is no problem in the program as pi points to a valid location. 
Also, in scanf() we pass address of a variable and pi is an address.
2) Consider the function func shown below: 
 

The value returned by func(435)is __________.
Answer: 9 
Explanation: The function mainly returns position of Most significant bit in binary representation of n. The MSD in binary representation of 435 is 9th bit.
3) Consider the C function given below. 
 

Which one of the following is TRUE? 
(A) The function returns 0 for all values of j. 
(B) The function prints the string something for all values of j. 
(C) The function returns 0 when j = 50. 
(D) The function will exhaust the runtime stack or run into an infinite loop when j = 50
Answer: (D) 
Explanation: When j is 50, the function would call itself again and again as neither i nor j is changed inside the recursion.
4) Consider the C function given below. Assume that the array listA contains n (> 0) elements, sorted in ascending order. 
 

Which one of the following statements about the function ProcessArray is CORRECT? 
(A) It will run into an infinite loop when x is not in listA. 
(B) It is an implementation of binary search. 
(C) It will always find the maximum element in listA. 
(D) It will return -1 even when x is present in listA.
Answer: (B) 
Explanation: The program is a simple iterative C implementation of Binary Search. 
5) Consider the following function 
 

Give a value q (to 2 decimals) such that f(q) will return q:_____.
Answer: 1.732 
Explanation: 
The main thing to note is the expression "abs(x*x - 3) < 0.01" inside the if condition. The function would return x when (x²  - 3 ) is close to 0 (smaller than 0.01) which means when x is close to square root of 3. Square root of 3 is 1.732.
See following for complete solutions of all GATE CS 2014 papers 
GATE-CS-2014-(Set-1) 
GATE-CS-2014-(Set-2) 
GATE-CS-2014-(Set-3)
Please write comments if you find any of the answers/explanations incorrect, or you want to share more information about the topics discussed above.