What is the initial value for both front and rear?

What is the initial value for both front and rear?

Initially the queue is empty and value of front and rear is both -1. When an element is inserted the value of rear will be incremented by 1 and the element would be inserted at the array index specified by the rear variable.

How do you find the front and rear of a circular queue?

In a circular queue, the element is always deleted from front position.

1. Check whether queue is Empty means check (front==-1).
2. If it is empty then display Queue is empty.
3. Check if (front==rear) if it is true then set front=rear= -1 else check if (front==size-1), if it is true then set front=0 and return the element.

What is the value for rear in circular queue?

If rear != max – 1, then rear will be incremented to mod(maxsize) and the new value will be inserted at the rear end of the queue. If front != 0 and rear = max – 1, it means that queue is not full, then set the value of rear to 0 and insert the new element there.

What is the initial value of queue?

Initially, the value of front and queue is -1 which represents an empty queue.

What is the value of front and rear when the queue is empty?

When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct.

What would be the new value of front and rear when an element has to be deleted from queue?

and then two elements are deleted. Now, when first element is deleted from Front it will point to 6 index, i.e. Front becomes equal to Rear. Then, after deleting one more element, queue will become empty and both Front and Rear becomes equal to -1.

What is the benefit of circular queue?

Advantages. Circular Queues offer a quick and clean way to store FIFO data with a maximum size. Conserves memory as we only store up to our capacity (opposed to a queue which could continue to grow if input outpaces output.)

What is the need for circular queue?

What is the need for a circular queue? Priority queue is used to delete the elements based on their priority. Higher priority elements will be deleted first whereas lower priority elements will be deleted next. Queue data structure always follows FIFO principle.

What is the use of front and rear in queue?

Front is used to get the front data item from a queue. Rear is used to get the last item from a queue.

What does rear Max 1 then setting rear 0 mean?

If front!= 0 and rear=MAX -1, then it means that the queue is not full. So, set rear = 0 and insert the new element.

What does front ==- 1 and rear ==- 1 indicates in queue?

In the beginning when the queue is empty, FRONT and REAR point to 0 index in the array. REAR represents insertion at the REAR index. FRONT represents deletion from the FRONT index.

What do we mean by front and rear in a queue?

A queue is an ordered collection of items where the addition of new items happens at one end, called the “rear,” and the removal of existing items occurs at the other end, commonly called the “front.” As an element enters the queue it starts at the rear and makes its way toward the front, waiting until that time when …

How does the circular queue work?

The circular queue work as follows: 1 two pointers FRONT and REAR 2 FRONT track the first element of the queue 3 REAR track the last elements of the queue 4 initially, set value of FRONT and REAR to -1 More

When is the front of the queue equal to the rear?

When Queue Full : ( REAR+1)\%n = (4+1)\%5 = 0 FRONT is also 0. Hence ( REAR + 1 ) \%n is equal to FRONT. When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct.

What is the value of (rear + 1 ) \%n?

Hence ( REAR + 1 ) \%n is equal to FRONT. When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct. Writing code in comment?

What is the value of tail and head pointers of queue?

In the diagrams above the queue has a size of 8, hence, the value of tail and head pointers will always be between 0 and 7.