Adding element to stack means ___________....

MCQ

Adding element to stack means ___________.

Placing element at the rear end

Placing element at the top

Placing element at the front end

None of these

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MCQ

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

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

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

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

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

Discussion

MCQ

Consider these functions:
push() : push an element into the stack

pop() : pop the top-of-the-stack element

top() : returns the item stored in top-of-the-stack-node

What will be the output after performing these sequence of operations

push(20);

push(4);

top();

pop();

pop();

pop();

push(5);

top();

stack underflow

Discussion

MCQ

Which data structure can be used suitably to solve the Tower of Hanoi problem?

Tree

Heap

Priority queue

Stack

Discussion

MCQ

What will be the value of top, if there is a size of stack STACK_SIZE is 5

None of the above

Discussion

MCQ

If the sequence of operations -

push(1)
push(2)
pop
push(1)
push(2)
pop
pop
pop
push(2)
pop

are performed on a stack, the sequence of popped out values are ?

2, 2, 1, 1, 2

2, 2, 1, 2, 2

2, 1, 2, 2, 1

2, 1, 2, 2, 2

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Data Structure Basics

Abstract data types

Arrays

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Queues

Trees

Binary Trees

B Trees

Heaps

Hash based structures

Graphs

Mixed

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