adplus-dvertising
frame-decoration

Question

Select the code snippet which returns the top of the stack.
a)

public int top()
{
       if(q1.size()>0)
       {
            return q1.poll();
       }
       else if(q2.size()>0)
       {
            return q2.poll();
       }
       return 0;
}

b)

public int top()
{
       if(q1.size()==0)
       {
            return q1.peek();
       }
       else if(q2.size()==0)
       {
            return q2.peek();
       }
        return 0;
    }

c)

public int top()
{
       if(q1.size()>0)
       {
            return q1.peek();
       }
       else if(q2.size()>0)
       {
            return q2.peek();
       }
       return 0;
}

d) None of the mentioned

a.

a

b.

b

c.

c

d.

d

Answer: (c).c

Engage with the Community - Add Your Comment

Confused About the Answer? Ask for Details Here.

Know the Explanation? Add it Here.

Q. Select the code snippet which returns the top of the stack.

Similar Questions

Discover Related MCQs

Q. To implement a stack using queue(with only enqueue and dequeue operations), how many queues will you need?

Q. After performing these set of operations, what does the final list look contain?

InsertFront(10);

InsertFront(20);

InsertRear(30);

DeleteFront();

InsertRear(40);

InsertRear(10);

DeleteRear();

InsertRear(15);

display();

Q. What is the time complexity of deleting from the rear end of the dequeue implemented with a singly linked list?

Q. What are the applications of dequeue?

Q. What is a dequeue?

Q. What is the time complexity to insert a node based on position in a priority queue?

Q. What are the advantages of priority queues?

Q. What is not a disadvantage of priority scheduling in operating systems?

Q. What is the time complexity to insert a node based on key in a priority queue?

Q. Which of the following is not an application of priority queue?

Q. With what data structure can a priority queue be implemented?

Q. The essential condition which is checked before deletion in a linked queue is?

Q. The essential condition which is checked before insertion in a linked queue is?

Q. In linked list implementation of a queue, the important condition for a queue to be empty is?

Q. In linked list implementation of a queue, from where is the item deleted?

Q. In case of insertion into a linked queue, a node borrowed from the __________ list is inserted in the queue.

Q. In linked list implementation of a queue, front and rear pointers are tracked. Which of these pointers will change during an insertion into EMPTY queue?

Q. In linked list implementation of a queue, front and rear pointers are tracked. Which of these pointers will change during an insertion into a NONEMPTY queue?

Q. In linked list implementation of a queue, where does a new element be inserted?

Q. In linked list implementation of queue, if only front pointer is maintained, which of the following operation take worst case linear time?