Welcome to the Stacks and Queues MCQs Page
Dive deep into the fascinating world of Stacks and Queues with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Stacks and Queues, a crucial aspect of Data Structures and Algorithms. In this section, you will encounter a diverse range of MCQs that cover various aspects of Stacks and Queues, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Data Structures and Algorithms.
Check out the MCQs below to embark on an enriching journey through Stacks and Queues. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Data Structures and Algorithms.
Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Stacks and Queues. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!
Stacks and Queues MCQs | Page 19 of 25
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Assume: ‘a’ is a non empty array of integers, the Stack class creates an array of specified size and provides a top pointer indicating TOS(top of stack), push and pop have normal meaning.
public void some_function(int[] a)
{
Stack S=new Stack(a.length);
int[] b=new int[a.length];
for(int i=0;i<a.length;i++)
{
S.push(a[i]);
}
for(int i=0;i<a.length;i++)
{
b[i]=(int)(S.pop());
}
System.out.println("output :");
for(int i=0;i<b.length;i++)
{
System.out.println(b[i]);
}
}Select from the options the appropriate pop() operation that can be included in the Stack class. Also ‘first’ is the top-of-the-stack.
class Node
{
protected Node next;
protected Object ele;
Node()
{
this(null,null);
}
Node(Object e,Node n)
{
ele=e;
next=n;
}
public void setNext(Node n)
{
next=n;
}
public void setEle(Object e)
{
ele=e;
}
public Node getNext()
{
return next;
}
public Object getEle()
{
return ele;
}
}
class Stack
{
Node first;
int size=0;
Stack()
{
first=null;
}
}
a)
public Object pop()
{
if(size == 0)
System.out.println("underflow");
else
{
Object o = first.getEle();
first = first.getNext();
size--;
return o;
}
}
b)
public Object pop()
{
if(size == 0)
System.out.println("underflow");
else
{
Object o = first.getEle();
first = first.getNext().getNext();
size--;
return o;
}
}
c)
public Object pop()
{
if(size == 0)
System.out.println("underflow");
else
{
first = first.getNext();
Object o = first.getEle();
size--;
return o;
}
}
d)
public Object pop()
{
if(size == 0)
System.out.println("underflow");
else
{
first = first.getNext().getNext();
Object o = first.getEle();
size--;
return o;
}
}public Object some_func()throws emptyStackException
{
if(isEmpty())
throw new emptyStackException("underflow");
return first.getEle();
}public void display()
{
if(size == 0)
System.out.println("underflow");
else
{
Node current = first;
while(current != null)
{
System.out.println(current.getEle());
current = current.getNext();
}
}
}
class Node
{
protected Node next;
protected Object ele;
Node()
{
this(null,null);
}
Node(Object e,Node n)
{
ele=e;
next=n;
}
public void setNext(Node n)
{
next=n;
}
public void setEle(Object e)
{
ele=e;
}
public Node getNext()
{
return next;
}
public Object getEle()
{
return ele;
}
}
class Stack
{
Node first;
int size=0;
Stack()
{
first=null;
}
}
a)
public void push(Object item)
{
Node temp = new Node(item,first);
first = temp;
size++;
}
b)
public void push(Object item)
{
Node temp = new Node(item,first);
first = temp.getNext();
size++;
}
c)
public void push(Object item)
{
Node temp = new Node();
first = temp.getNext();
first.setItem(item);
size++;
}
d) none of the mentioned
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