What is Queue Data Structure ? | Queue Operations & Working | C++ Program to Implement Queue Operations

Definition – 
Queue is a linear data structure which operates in a First IN First OUT or Last IN Last OUT.
  • It is named queue as it behaves like a real-world queue, for example – queue(line) of cars in a single lane, queue of people waiting at food counter etc.
  • Queue is an abstract data type with a bounded (predefined) capacity.
  • It is a simple data structure that allows adding and removing elements in a particular order.
  • The order is FIFO(First IN First OUT) or LILO(Last In Last Out).

queue data structure diagram

Standard Queue Operations – 
  • Enqueue() – Add item to the queue from the REAR.
  • Dequeue() – Remove item from the queue from the FRONT.
  • isFull() – Check if queue is full or not.
  • isEmpty() – Check if queue empty or not.
  • count() – Get number of items in the queue.
Some types of Queue (We will discuss them in detail in other articles)-
  • Simple Queue
  • Circular Queue
  • Priority Queue
Some Applications of Queue Data Structure –

Queue is used when things but have to be processed in First In First Out order. Like –

  • CPU scheduling, Disk Scheduling.
  • Handling of interrupts in real-time systems. The interrupts are handled in the same order as they arrive, First come first served.
  • In real life, Call Center phone systems will use Queues, to hold people calling them in an order, until a service representative is free.
  • When data is transferred asynchronously between two processes. Queue is used for synchronization.
Program Code for Queue Data Structure in C++ Programming –
YouTube video tutorials –

1. Queue Data Structure Theory –

2. Queue Data Structure C++ Program Implementation –

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