@author Ankit Singh
GLA university mathura (u.p)

CircularQueueUsingArray

Full implementation of Circular queue using array.

1. enqueue
   if (rear+1)%max==front,queue is full, overflow;
   if (rear != max-1),means rear pointer is not at last index, increment rear by one.;
   if (front != 0) && (rear=max-1), means rear pointer at last index and first index is empty, rotate rear to 0 index.;

2. dequeue
   if (front=-1), queue is empty, underflow;
   if (rear==front), only one element, set rear and front to -1;
   if (front==max-1), value will delete from last index, set front to 0;

3. peek
   print queue[front]

4. isEmpty