C | Storage Classes and Type Qualifiers | Question 11

Consider the following C function

int f(int n)
{
   static int i = 1;
   if (n >= 5)
      return n;
   n = n+i;
   i++;
   return f(n);
}

The value returned by f(1) is (GATE CS 2004)

(A) 5
(B) 6
(C) 7
(D) 8


Answer: (C)

Explanation: Since i is static, first line of f() is executed only once.

Execution of f(1)
    i = 1
    n = 2
    i = 2
 Call f(2)
    i = 2
    n = 4
    i = 3
 Call f(4)
   i = 3
   n = 7
   i = 4
 Call f(7)
  since n >= 5 return n(7)

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