This program illustrates the use of the istream_iterator and ostream_iterator
in conjunction with the copy algorithm to provide "vector I/O".
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Initial contents of v, displayed using the copy algorithm to copy values from
v to the standard output with the help of an ostream_iterator:
1 2 3 4 5
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Now we copy some values from standard input into a vector
using the copy algorithm and an istream_iterator.
Enter five integer values, followed by your end-of-file character:
2 4 6 8 10
^Z

Final contents of v: 2 4 6 8 10
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