GATE | GATE CS 2013 | Question 42

What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.

int f(int &x, int c) { 
   c = c - 1; 
   if (c==0) return 1; 
   x = x + 1; 
   return f(x,c) * x; 
}

(A) 3024
(B) 6561
(C) 55440
(D) 161051

Answer: (B)

Explanation: See http://quiz.geeksforgeeks.org/c-references-question-1/

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