If we add A, B, C, and D in a queue (row) in FIFO order, then the order of removal elements will be:
1st A, 2nd B, 3rd C, and the last removal element will be D
The queue is an arrangement of words, numbers, or any given data in a straight line or a row format. The data can only be inserted/added from one end of the row, which is also called the rear end. And we remove the data from the other or opposite end of the row/line, known as the front end.
(Rear end) _______________ (Front end)
(Front end) _______________ (Rear end)
We can place data in a specific way in a queue:
FIFO Order (First In, First Out): The first object that enters a queue will also be the first to exit the line.
If we add A to a queue, followed by B, C, and D, then A will be the first to be deleted, followed by B, C, and D.
(Empty)
A
B, A
C, B, A
D, C, B, A (All the objects entered the queue)
D, C, B
D, C
D
(Empty)
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