ISRO | ISRO CS 2020 | Question 34

Consider the following recursive C function that takes two arguments

unsigned int rer (unsigned int n, unsigned int r) {
  if (n > 0) return (n% r + rer(n/r, r));
  else return 0;
 } 

What is the return value of the function rer when it is called as rer (513, 2) ?
(A) 9
(B) 8
(C) 5
(D) 2


Answer: (D)

Explanation:

= rer (513, 2)
= 513% 2 + 256% 2 + 128% 2 + 64% 2 + 32% 2 + 16% 2 + 8%2 + 4%2 + 2%2 + 1%2 

Hence, output will be,

= 1 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 1 
= 2 

So, option (D) is correct.

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