Data Structures | Queue | Question 11

Consider the following pseudo code. Assume that IntQueue is an integer queue. What does the function fun do?

void fun(int n)
{
    IntQueue q = new IntQueue();
    q.enqueue(0);
    q.enqueue(1);
    for (int i = 0; i < n; i++)
    {
        int a = q.dequeue();
        int b = q.dequeue();
        q.enqueue(b);
        q.enqueue(a + b);
        print(a);
    }
}

(A) Prints numbers from 0 to n-1
(B) Prints numbers from n-1 to 0
(C) Prints first n Fibonacci numbers
(D) Prints first n Fibonacci numbers in reverse order.


Answer: (C)

Explanation: The function prints first n Fibonacci Numbers. Note that 0 and 1 are initially there in q. In every iteration of loop sum of the two queue items is enqueued and the front item is dequeued.

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