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 21 of 25
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a)
private void expand()
{
int length = size();
int[] newQ = new int[length<<1];
for(int i=front; i<=rear; i++)
{
newQ[i-front] = Q[i%CAPACITY];
}
Q = newQ;
front = 0;
rear = size()-1;
}
b)
private void expand()
{
int length = size();
int[] newQ = new int[length<<1];
for(int i=front; i<=rear; i++)
{
newQ[i-front] = Q[i%CAPACITY];
}
Q = newQ;
}
c)
private void expand()
{
int length = size();
int[] newQ = new int[length<<1];
for(int i=front; i<=rear; i++)
{
newQ[i-front] = Q[i];
}
Q = newQ;
front = 0;
rear = size()-1;
}
d)
private void expand()
{
int length = size();
int[] newQ = new int[length*2];
for(int i=front; i<=rear; i++)
{
newQ[i-front] = Q[i%CAPACITY];
}
Q = newQ;
}public class CircularQueue
{
protected static final int CAPACITY = 100;
protected int size,front,rear;
protected Object q[];
int count = 0;
public CircularQueue()
{
this(CAPACITY);
}
public CircularQueue (int n)
{
size = n;
front = 0;
rear = 0;
q = new Object[size];
}
public void enqueue(Object item)
{
if(count == size)
{
System.out.println("Queue overflow");
return;
}
else
{
q[rear] = item;
rear = (rear+1)%size;
count++;
}
}
public Object dequeue()
{
if(count == 0)
{
System.out.println("Queue underflow");
return 0;
}
else
{
Object ele = q[front];
q[front] = null;
front = (front+1)%size;
count--;
return ele;
}
}
public Object frontElement()
{
if(count == 0)
return -999;
else
{
Object high;
high = q[front];
return high;
}
}
public Object rearElement()
{
if(count == 0)
return -999;
else
{
Object low;
rear = (rear-1)%size;
low = q[rear];
rear = (rear+1)%size;
return low;
}
}
}
public class CircularQueueDemo
{
public static void main(String args[])
{
Object var;
CircularQueue myQ = new CircularQueue();
myQ.enqueue(10);
myQ.enqueue(3);
var = myQ.rearElement();
myQ.dequeue();
myQ.enqueue(6);
var = mQ.frontElement();
System.out.println(var+" "+var);
}
}
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