This program illustrates all of the STL list container class constructors, as
well as the default list iterator and the member functions begin() and end().
It also shows how ordinary pointers can be used, in certain situations, in the
same way that STL iterators are used.
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Contents of lst1:
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Contents of lst2: 0 0 0 0 0
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Contents of lst3: 3.14 3.14 3.14 3.14
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Contents of lst4: 2 4 6 8 10 12
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Contents of lst5: H e l l o
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Contents of lst6 same as those of lst3: 3.14 3.14 3.14 3.14
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