Queue in Data Structure

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Queue in Data Structure

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Queue is an abstract data structure, somewhat similar to Stacks. Unlike stacks, a queue is open at both ends. One end is always used to insert data (enqueue) and the other is used to remove data (dequeue). Queue follows the First-In-First-Out methodology, i.e., the data item stored first will be accessed first.

A Queue is like a line waiting to purchase tickets, where the first person in line is the first person served. (i.e. First come first serve). A real-world example of queue can be a single-lane one-way road, where the vehicle enters first, exits first. More real-world examples can be seen as queues at the ticket windows and bus-stops.

Queue in Data Structure

Queue operations may involve initializing or defining the queue, utilizing it, and then completely erasing it from the memory. Here we shall try to understand the basic operations associated with queues −

  • enqueue() − add (store) an item to the queue.
  • dequeue() − remove (access) an item from the queue.

Few more functions are required to make the above-mentioned queue operation efficient. These are −

  • peek() − Gets the element at the front of the queue without removing it.
  • isfull() − Checks if the queue is full.
  • isempty() − Checks if the queue is empty.

In queue, we always dequeue (or access) data, pointed by front pointer and while enqueing (or storing) data in the queue we take help of rear pointer.

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Queue in Data Structure

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