This program illustrates all constructors of the STL vector container class,
as well as the empty() and size() member functions, the size_type typedef, and
the v[i] method of accessing vector components.
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v1 is empty.
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Contents of v2: 0 0 0 0 0
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Contents of v3: 3.14 3.14 3.14 3.14
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Contents of v4: 2 4 6 8 10 12
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Contents of v5: H e l l o
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Contents of v6 same as those of v3: 3.14 3.14 3.14 3.14
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