Circular queues and implement circular queues using array, Data Structure & Algorithms

Assignment Help:

Explain what are circular queues? Write down routines required for inserting and deleting elements from a circular queue implemented using arrays.

         Circular queue: Static queues have a very big disadvantage that once the queue is

FULL, even though we delete or remove few elements from the "front" and relieve some occupied space, even then we are not able to add anymore elements as the "rear" has already reached the Queue's rear most position.

The solution lies in a type of queue in which the moment "rear" reaches its end; the "first" element will automatically become the queue's new "rear". This type of queue is well known as circular queue possessing a structure like this in which, once the Queue is full the "First" element of the Queue becomes the "Rear" most element, if and only if the "Front" of it has moved forward;

Circular Queue using an array:-

insert(queue,n,front,rear,item)

This procedure inserts an element item into a queue.

1. If front = 1 and rear = n, or if front = rear

+ 1, then:

Write: overflow, and return

2. [find new value of rear]

If front = NULL , then : [queue initially empty.]

Set front = 1 and rear=1. Else if rear = n, then:

Set rear=1.

Else:

Set  rear = rear + 1. [end of structure.]

3. Set queue[rear] = item. [this inserts new

element.]

4.Return .

delete(queue,n,front,rear,item)

This procedure deletes an element from a queue and assigns it to the variable item.

1.   [queue already empty?] If front = NULL , then:

Write: underflow, and return.

2.   Set item = queue[front].

3.   [find new value of front]

If front = rear , then : [queue has only one element to start].

Set front = NULL and rear = NULL. Else if front = n, then:

Set front=1.

Else:

Set  front = front + 1. [end of structure.]

4.   Return .


Related Discussions:- Circular queues and implement circular queues using array

Finite automata, find the grammar of regular expression of (a/?)(a/b)?

find the grammar of regular expression of (a/?)(a/b)?

Brute force, Determine the number of character comparisons made by the brut...

Determine the number of character comparisons made by the brute-force algorithm in searching for the pattern GANDHI in the text

Implementation of dequeue, Dequeue (a double ended queue) is an abstract da...

Dequeue (a double ended queue) is an abstract data type alike to queue, where insertion and deletion of elements are allowed at both of the ends. Like a linear queue & a circular q

Searching, Searching is the procedure of looking for something: Finding one...

Searching is the procedure of looking for something: Finding one piece of data that has been stored inside a whole group of data. It is frequently the most time-consuming part of m

Explain about franklin algorithm, Explain about Franklin Algorithm We m...

Explain about Franklin Algorithm We mentioned how the number of possible comparisons of polygons grows as the square of the number of polygons in the scene. Many of the hidden-

What is complexity, Complexity is the rate at which the needed storage or c...

Complexity is the rate at which the needed storage or consumed time rise as a function of the problem size. The absolute growth based on the machine utilized to execute the program

Define algorithm, What is an Algorithm? An algorithm is a sequence of u...

What is an Algorithm? An algorithm is a sequence of unambiguous instructions for solving a problem, i.e., for getting a needed output for any legitimate input in a finite amoun

Create a binary tree , Create a class "box" that will contain a random inte...

Create a class "box" that will contain a random integer value v such that O

Booth algorithm, what is boot algorithm and some example

what is boot algorithm and some example

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd