This program illustrates the assignment of one queue to another,
and the comparison of queues.
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The queue q1 contains 4 values.
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Now we create three new empty queues-q2, q3, q4-and assign q1 to all three.
Then we display the contents of q1 to show what q2, q3 and q4 all contain.
Note that the process of displaying the values in q1 empties q1.
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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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Next we display the contents of q2 to confirm that q1 did get assigned to q2.
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Here are the values of q2, in "FIFO" order:
Popping: 1
Popping: 2
Popping: 3
Popping: 4
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Finallly, we push the value 5 onto q4, and then we output the result of
comparing q3 and q4 using each of the relational operators.
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q3 == q4 is false.
q3 != q4 is true.
q3 <  q4 is true.
q3 <= q4 is true.
q3 >  q4 is false.
q3 >= q4 is false.
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