A queue is linear data structure where the elements are stored in
linear manner. A queue is also called as FIFO ( Fist In First Out) that
is the first inserted element is deleted first. The following are some
of the real time situations where you can see queue applications.

In Data structure a queue is also use
similarly as above image and elements are inserted at one end called
rear end and are deleted at another end called front end. The following
figure shows this

struct queue

{

int que[size];

int front;

int rear;

}

The insertion of any element in the queue will always take place from the rear end. Before performing insertion operation you must check whether the queue is full or not. If the rear pointer is going beyond the maximum size of the queue then the queue overflow occurs

The deletion of any element in the queue takes place by the front end always.Before performing any delete operation one must check whether the queue is empty or not. If the queue is empty, you can't perform the deletion. The result is illegal attempt to delete an element from the empty queue is called the queue Underflow condition.

- In operating systems where the jobs are waiting for resources are minted in a queue called waited queue .
- In Transport where all the vehicle follow the queue
- In computer science engineering applications.

queue of people waiting for some thing |

In the above Figure the element 6 is entered first and it is deleted
first, that is why java called as FIFO. The insertion operation is
called Enqueue and the deletion operation is called Dequeue. All the
general operations performed on a data structure can be done on queue.

#### Basic Queue Operations

As we have know, queue is nothing but the collection of items. Both the ends of the queue are having their own functionality. The queue is also called as FIFO. All the elements in the queue are stored sequentially. The various operations on the queue are-- Queue overflow
- Insertion of elements into the queue
- Queue underflow
- Deletion of the elements from the queue
- Displaying of the queue

struct queue

{

int que[size];

int front;

int rear;

}

#### Insertion of element int the queue

The insertion of any element in the queue will always take place from the rear end. Before performing insertion operation you must check whether the queue is full or not. If the rear pointer is going beyond the maximum size of the queue then the queue overflow occurs

**.**

#### Deletion of element from the queue

The deletion of any element in the queue takes place by the front end always.Before performing any delete operation one must check whether the queue is empty or not. If the queue is empty, you can't perform the deletion. The result is illegal attempt to delete an element from the empty queue is called the queue Underflow condition.

### Applications of Queue

The following are the applications of Queue

- Queue are used in operating systems for scheduling the jobs
- Queue are for categorizing data
- Queue are used in simulation and modeling

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