This program illustrates the use of the istream_iterator and ostream_iterator
in conjunction with the copy algorithm to provide "deque I/O".
Press Enter to continue ...

Initial contents of q, displayed using the copy algorithm to copy values from
q to the standard output with the help of an ostream_iterator:
1 2 3 4 5
Press Enter to continue ...

Now we copy some values from standard input into a deque
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 q: 2 4 6 8 10
Press Enter to continue ...