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# C Language | Set 10

• Difficulty Level : Easy
• Last Updated : 18 Feb, 2021

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

## C

 `#include ``main()``{``    ``int` `i;``    ``int` `*pi = &i;``    ``scanf``(``"%d"``, pi);``    ``printf``(``"%d\n"``, i+5);``}`

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.
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:

## C

 `int` `func(``int` `num)``{``    ``int` `count = 0;``    ``while` `(num)``    ``{``        ``count++;``        ``num >>= 1;``    ``}``    ``return` `(count);``}`

The value returned by func(435)is __________.
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.

## C

 `int` `f(``int` `j)``{``  ``static` `int` `i = 50;``  ``int` `k;``  ``if` `(i == j)``  ``{``    ``printf``(``"something"``);``    ``k = f(i);``    ``return` `0;``  ``}``  ``else` `return` `0;``}`

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
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.

## C

 `int` `ProcessArray(``int` `*listA, ``int` `x, ``int` `n)``{``    ``int` `i, j, k;``    ``i = 0;``    ``j = n-1;``    ``do``{``        ``k = (i+j)/2;``        ``if` `(x <= listA[k])``            ``j = k-1;``        ``if` `(listA[k] <= x)``            ``i = k+1;``    ``} ``while` `(i <= j);``    ``if` `(listA[k] == x)``        ``return``(k);``    ``else``        ``return` `-1;``}`

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.
Explanation: The program is a simple iterative C implementation of Binary Search
5) Consider the following function

## C

 `double` `f(``double` `x)``{``   ``if` `(``abs``(x*x - 3) < 0.01) ``return` `x;``   ``else` `return` `f(x/2 + 1.5/x);``}`

Give a value q (to 2 decimals) such that f(q) will return q:_____.