This program illustrates the creation of a queue using values from a deque
(when the underlying container is the default one, namely a deque), and from
a list, when the underlying container is a list.
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The queue q1 is created from a deque of 4 values.
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Here are the values of q1, in "FIFO" order:
Popping: 1
Popping: 2
Popping: 3
Popping: 4
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The queue q2 is created from a list of 6 values.
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Here are the values of q2, in "FIFO" order:
Popping: 6
Popping: 9
Popping: 8
Popping: 10
Popping: 5
Popping: 7
Press Enter to continue ...