QUEUE:-
A Queue is FIFO(First in First Out) abstract data type and linear data structure.A Queue can have any abstract data type as an element,but is characterized by two fundamental operation, called Enqueue and Dequeue has two pointers Front and rear.
The Enqueue operation adds a new item to the front of queue or initialize the queue if it is empty.If the Queue is full and does not contain enough space to accept the given item.then the queue is consider to be in an overflow state.
The Dequeue operation removes an from front of the queue.A dequeue either revels previously concealed items or results in an array but if the queue is empty then it goes into underflow state(It Means no item present in queue to be removed)

WHILE THE DEALING WITH THE CIRCULAR QUEUE WE WILL USE THE FOLLOWING ASSUMPTIONS:-

1.First will always be pointing to the first element of the queue.

2.Each time New element inserted the queue the value of rear increase by one.i.e, rear=rear+1.

3.Each time when an existing element is deleted from the queue,the value of front is incremented by one.i.e, front = front +1.
4.Front is the intial or first location of the queue where rear is th e last location of the queue.(Entry Location).