This program illustrates all constructors of the STL deque container class,
as well as the empty() and size() member functions, the size_type typedef,
and the d[i] method of accessing deque components.
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d1 is empty.
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Contents of d2: 0 0 0 0 0
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Contents of d3: 3.14 3.14 3.14 3.14
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Contents of d4: 2 4 6 8 10 12
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Contents of d5: H e l l o
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Contents of d6 same as those of d3: 3.14 3.14 3.14 3.14
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