The CQueue class should include the following methods:

$1.$ a default constructor.

$2.$ a Front method to return a CQueue$$s front element.

$3.$ a Back method to return a CQueue$$s back element.

$4.$ an Empty method to determine whether a CQueue is empty

$5.$ a Push method to add an element into the CQueue.

$6.$ a Pop method to delete an element out from the CQueue.

$7.$ a Print method to output the CQueue contents using an iterator