This program illustrates typical uses of the default vector class iterator
(which is a random access iterator), and also shows the use of operators
->, [], <, >, <=, >=, +=, -= and == with vector class iterators. Note the
strong analogies between vector class iterators and pointers.
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Here are the values in our vector:
1 2 4 8 16 32 64
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p1 is set to point at the first component and p2 to one-past the last.
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p1[2] == p2[-5] == 4
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Now we perform p1 += 2; and p2 -= 5;.
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p1 == p2, so *p1 == *p2 == 4
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Now we've performed p1--; and p2++;, so ...
p1 < p2  is true
p1 <= p2 is true
p1 > p2  is false
p1 >= p2 is false
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Locations (accessed with the -> operator): (1, 2) (4, 5)
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