Question

If the numbers 15, 10, 3, 42 are enqueued onto a queue in that order, what does dequeue return?

Answer 1

A queue is an abstract data type that follows a First-In-First-Out (FIFO) data structure.  

In other words, the first element that enters the queue comes out of the queue first.  

Let's take a look at this with an example.

If the numbers 15, 10, 3, 42 are enqueued in that order, they get dequeued in the same order 15, 10, 3, 42.

Answer 2

refer pic and mark brain if u like