Why we need to use circular implementation in queues? How circular implementation works in queues?

Create a Java program that adds the numbers 1 through 50 to a stack called stack1.Then perform the following:
Finds all the odd numbers from stack1.Then, push them into a new stack named stack 2.
Find and print the prime numbers from stack2.
Question two
Consider the following initial state of a queue implemented using a circular array. Where F for “front” and B for “back” are shown on the queue.

101
102

F
B

Answer the following:
Why we need to use circular implementation in queues?
How circular implementation works in queues?
Show the queue state after each of the following operations with updating F & B as needed:
enqueue(103)

enqueue(104)

dequeue

enqueue(105)

Question Three
Write the pre-order, in-order and post-order traversals of the following binary search tree:
Question Two
Draw the binary search tree if the pre-order traversals of that binary search tree is given as below:
Pre-order traversal: 7, 4, 2, 3, 6, 5, 12, 9, 8, 11, 19, 15, 20

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