GATE | GATE-CS-2016 (Set 1) | Question 45

What will be the output of the following JAVA program? 

Java

class GFG
{
   static int d=1;
   static void count(int n)
    {
    System.out.print(n+" ");
    System.out.print(d+" ");
    d++;
    if(n > 1) count(n-1);
    System.out.print(d+" ");
  }

 public static void main(String args[])
    {
       count(3);
    }
}

(A)

3 1 2 2 1 3 4 4 4

(B)

3 1 2 1 1 1 2 2 2

(C)

3 1 2 2 1 3 4

(D)

3 1 2 1 1 1 2

Answer: (A)

Explanation:

count(3) will print value of n and d. So 3 1 will be printed 
and d will become 2. 

Then count(2) will be called. It will print value of n and d. 
So 2 2 will be printed and d will become 3. 

Then count(1) will be called. It will print value of n and d.
So 1 3 will be printed and d will become 4. 

Now count(1) will print value of d which is 4. count(1) will 
finish its execution. 

Then count(2) will print value of d which is 4. 

Similarly, count(3) will print value of d which is 4. 
So series will be A.

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