This program illustrates typical uses of the default vector class iterator
(which is a random access iterator), and shows additional uses of member
functions begin() and end(). It also shows the use of operators =, +, -, ++,
--, != and * with vector class iterators.
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First we enter some integer squares into a vector of size 8, and then display:
0 1 4 9 16 25 36 49
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Next we double the values in the vector and re-display (backwards this time):
98 72 50 32 18 8 2 0
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Finally, we display (using iterators) some particular vector values:
First component of the vector = 0
Third component of the vector = 8
Last component of the vector  = 98
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