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  • Queue is a linear data structure where insertion and deletion operations are performed at the both end.
  • Queue is also known as FIFO (first in first out) because the element which was inserted first is deleted first.
  • A queue is like ticket window, where whoever comes first, gets served first.


  • In a queue there are two ends, front-end and rear-end.
  • Insertion in queue is done from rear-end which is called enqueue.
  • Deletion in queue is done at the front-end which is called dequeue.
  • Characteristics of queue:
    • Queue can handle multiple data.
    • In queue we can access both ends.
    • Queue is fast and flexible.
  • Operations on queue:
    • Insertion
    • Deletion
    • Traversing
  • Types of Queue
    • Singular Queue
    • Circular Queue.

Concept of Circular Queue

  • Circular queue is normal queue but looped in circular manner.

  • Circular queue doesn’t have any null character at the end.

  • The manner of circular queue is set in a way that no number of memory wastes.

  • All the data in circular queue are looped and start pointer is connected with the last pointer.


  • Circular queue doesn’t waste any memory like normal queue.

  • When element is deleted in normal queue the space that it left becomes non-usable.

  • Where the circular queue it takes the empty space and make good use of it.

  • Operations on circular queue:

    • Insertion (Enqueue)
    • Deletion (Dequeue)
    • IsEmpty/IsFull
  • Application of circular queue:

    • Memory management
      • Circular queue is used in memory management
    • Process Scheduling
      • A CPU uses a queue to schedule processes.
    • Traffic System
      • Queues are also used in traffic systems.

Application of Queue

  • Task Scheduling
    • Queues can be used to manage and schedule the task based on priority or the order in which they were received.
  • Operating System
    • Operating systems often uses Queue to manage the task of processing and resources.
  • Resource Allocation
    • Queues can be used to manage and allocate the resources to task based on their priority or in the order they were received.
  • Batch Processing
    • Queues can be used to handle batch processing jobs such as data analysis or image rendering.
  • Web Servers
    • Queues can help to manage incoming client requests and outgoing server data efficiently.
  • Printer queues
    • Queues in printer helps to manage queue of pending prints.

Differentiate circular queue ad simple queue

Simple Queue Circular Queue
Elements are in sequential and linear manner. Elements are in circular manner loop through entire queue
Insertion is done from rear-end and deletion from the front-end. Insertion and deletion can be done from any place any end.
Memory space is more occupied than circular queue. Memory space is less occupied than simple Queue
The usage of memory is inefficient. The memory can be more efficiently utilized.
It follows FIFO principle (First in First Out) It doesn’t have any specific manner

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