Implementation of circular queues, Data Structure & Algorithms

Assignment Help:

One of the main problems with the linear queue is the lack of appropriate utilization of space. Assume that the queue can store 100 elements & the complete queue is full. Thus, it means that the queue is holding 100 elements. In case, some elements at the front are deleted, at the last position the element in the queue continues to be at the similar position and there is no competent way to determine that the queue is not full. In this way, space utilization in the case of linear queues is not competent. This problem is arising because of the representation of the queue.

The substitute representation is to illustrate the queue as circular. In case, we are representing the queue by using arrays, then, a queue along n elements begin from index 0 and ends at n-1.So, obviously , the first element in the queue will be at index 0 and the last element will be at n-1 while all the positions among index 0 & n-1(both inclusive) are filled. Under such situation, front will point to 0 and rear will point to n-1. Though, while a new element is to be inserted and if the rear is pointing to n-1, then, it has to be checked if the position at index 0 is free. If yes, then the element can be inserted to that position & rear can be adjusted accordingly. In this way, the utilization of space is enhanced in the case of a circular queue.

In a circular queue, front will point to one position less to the first element anti-clock wise. Thus, if in the array the first element is at position 4, then the front will point to position 3. While the circular queue is created, then both front & rear point to index 1. Also, we can conclude that the circular queue is empty in case front & rear both point to the same index. Figure  illustrates a circular queue.


Related Discussions:- Implementation of circular queues

Four applications or implementation of the stack, Q. Write down any four ap...

Q. Write down any four applications or implementation of the stack.                                     Ans. (i)       The Conversion of infix to postfix form (ii)

Design a binary tree, (a) Suppose that t is a binary tree of integers (that...

(a) Suppose that t is a binary tree of integers (that is, an object of type BinTree of Int.) in the state shown in Figure 3.   Give the vectors returned by each of the f

Determine the precondition of a binary search, Determine the precondition o...

Determine the precondition of a binary search For instance, precondition of a binary search is that array searched is sorted however checking this precondition is so expensive

Algorithm to find maximum and minimum numbers, Give an algorithm to find bo...

Give an algorithm to find both the maximum and minimum of 380 distinct numbers that uses at most 568 comparisons.

Define about the structure - container, Define about the Structure - Contai...

Define about the Structure - Container - Some containers hold elements in some sort of structure, and some don't. Containers with no structure include bags and sets. Containe

Bubble sort, In this sorting algorithm, multiple swapping occurs in one pas...

In this sorting algorithm, multiple swapping occurs in one pass. Smaller elements move or 'bubble' up to the top of the list, so the name given to the algorithm. In this method,

Define wire-frame model, Define Wire-frame Model This skeletal view is ...

Define Wire-frame Model This skeletal view is called a Wire-frame Model. Although not a realistic representation  of the object, it is still very useful in the early stages of

Define chaining process of hashing, Chaining In this method, instead of...

Chaining In this method, instead of hashing function value as location we use it as an index into an array of pointers. Every pointer access a chain that holds the element havi

Algorithm for sorting a deck of cards, What is wrong with the following alg...

What is wrong with the following algorithm for sorting a deck of cards (considering the basic properties of algorithms)? I. Put the cards together into a pile II. For each ca

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