Dequeue: Dequeue function is used to delete an element from the queue. #1) Check if the circular queue is Empty: check if (front==-1). Let’s discuss some of the applications of the circular queue. Again let us insert element 13 in the circular queue. Given below is the linked list implementation of the circular queue in C++. If queue is not full then, check if (rear == SIZE – 1 && front != 0). Next, we insert or enqueue three more elements in the circular queue. The queue will look as shown below. regular queue implementation using arrays, add the new element in the position pointed to by, for the last element, reset the values of. Consider the following circular queue of 5 elements as shown below: When we insert the elements to make a queue full, the representation will be as shown below. In our next tutorial, we will learn about the double-ended queues that are simply called “deque”. Circular queues fix the major disadvantage of a normal queue wherein we cannot insert elements when the rear pointer is at the end of the queue even when we delete the elements and space is emptied. * Queue is used in BFS(Breadth First Search) algorithm. We have also seen the major operations of the circular queue. 3.2. Traffic system: In a computer-controlled traffic system, circular queues are used to switch on the traffic lights one by one repeatedly as per the time set. If it is true then set front=rear= -1 else check if (front==size-1), if it is true then set front=0 and return the element. Circular Queue works by the process of circular increment i.e. It helps in traversing a tree or graph. item 1 and item 3 from the queue as shown below. #3) Check if (front==rear). The most common queue implementation is using arrays, but it can also be implemented using lists. We have explored the types along with implementations. The different types of queues are linear queue, circular queue, priority queue and deque. Memory Management: The unused memory locations in the case of ordinary queues can be utilized in circular queues. Here, the circular increment is performed by modulo division with the queue size. It performs operations by following the FIFO (First In, First Out) approach and the last position in the queue is connected back to the first position to form a circle. A circular queue is a linear data structure that is used to store data items. The indexes 0 and 1 can only be used after the queue is reset when all the elements have been dequeued. * Queue is also used by Operating systems for job scheduling. If No, then increment the headpointer. Shruti Rawal 1) When a resource is shared among multiple consumers. We follow the following sequence of steps to insert a new element in the circular queue. #2) If the circular queue is full then it displays a message as “Queue is full”. Above shown is the output of circular queue operations. Due to this arrangement, space doesn’t go wasted as it happens in a linear queue. #2) If it is empty then display the message “Queue is empty”. © Parewa Labs Pvt. A circular queue is a linear data structure that is used to store data items. Python Basics Video Course now on Youtube! 2.2. The following diagram shows a circular queue. First, we add the elements and then dequeue or remove two elements. The first six elements are already in the queue and we see that the first position and last position are joined. Let’s implement the circular queue using C++. If queue is not empty then perform step 3. We see that unlike linear queue, the elements are added at the end of the queue. Some of the basic operations of the circular queue are as follows: Front: Returns the front position in the circular queue. Next, we insert or enqueue element 11 in the circular queue as represented below. Initialize the queue, with size of the queue defined (maxSize), and head and tailpointers. i.e. 4. Note that we make use of struct to represent each node. In circular queue it is necessary that: Before insertion, fullness of Queue must be checked (for overflow). If Yes, then return Queue is empty. #1) Check if the circular queue is full: test ((rear == SIZE-1 && front == 0) || (rear == front-1)), where ‘SIZE’ is the size of the circular queue. In the next section, we will learn about the basic operations of the circular queue. © Copyright SoftwareTestingHelp 2020 — Read our Copyright Policy | Privacy Policy | Terms | Cookie Policy | Affiliate Disclaimer | Link to Us, Look For The Entire C++ Training Series Here, Queue Data Structure In C++ With Illustration, Priority Queue Data Structure In C++ With Illustration, Circular Linked List Data Structure In C++ With Illustration, Data Mart Tutorial - Types, Examples & Implementation of Data Mart, Stack Data Structure In C++ With Illustration, Data Mining Examples: Most Common Applications of Data Mining 2020, Data Mart Tutorial – Types, Examples & Implementation of Data Mart. Hence we can consume the entire space of the queue till it becomes full. 3. The structure of the circular linked list is like a closed loop. Applications of Queue Data Structure. The output shows the circular queue after enqueue operation, dequeue and also after the second enqueue operation. when we try to increment any variable and we reach the end of the queue, we start from the beginning of the queue by modulo division with the queue size.

application of circular queue in data structure

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application of circular queue in data structure 2020