Types of Queue in C

February 24, 2023

circular queue

What are the different types of Queue?

There are four different types of Queue  each one has its own application. There different types of queue are:-

  • Simple Queue
  • Circular Queue
  • Priority Queue
  • Double Ended Queue

In this article, we will look at each type and learn where we can use them.

What are the different types of queue?

There different types of queue are:-

  • Simple Queue
  • Circular Queue
  • Priority Queue
  • Double Ended Queue

Simple Queue

A simple queue are the general queue that we use on perform insertion and deletion on FIFO basis i.e. the new element is inserted at the rear of the queue and an element is deleted from the front of the queue.

Simple queue in c

Applications of Simple Queue

The applications of simple queue are:-

  • CPU scheduling
  • Disk Scheduling
  • Synchronization between two process.
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Insertion in Queues Program

Deletion (Removal) in Queues Program

Reverse a Queue

Queues using Linked Lists

Implement Queue using Stack

Circular Queue​

Circular queue is a type of queue in which all nodes are treated as circular such that the first node follows the last node. It is also called ring buffer. In this type of queue operations are performed on first in first out basis i.e the element that has inserted first will be one that will be deleted first.

Circular Queue in c

Applications of Circular Queue

The applications of circular queue are:-

  • CPU scheduling
  • Memory management
  • Traffic Management

Priority Queue​

Priority Queue is a special type of queue in which elements are treated according to their priority. Insertion of an element take place at the rear of the queue but the deletion or removal of an element take place according to the priority of the element. Element with the highest priority is removed first and element with the lowest priority is removed last.

Priority Queue in c

Applications of Priority Queue

The applications of priority queue are:-

  • Dijkstra’s shortest path algorithm
  • Data compression in huffman codes.
  • Load balancing and interrupt handling in operating system.
  • Sorting heap.

Double Ended Queue​

Double ended queue are also known as deque. In this type of queue insertion and deletion of an element can take place at both the ends. Further deque is divided into two types:-

  • Input Restricted Deque :- In this, input is blocked at a single end but allows deletion at both the ends.
  • Output Restricted Deque :- In this, output is blocked at a single end but allows insertion at both the ends.
Deque in c

Applications of Double Ended Queue

The applications of double ended queue are:-

  • To execute undo and redo operation.
  • For implementing stacks.
  • Storing the history of web browsers.

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