This program illustrates the pair template struct.
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First we use the two-parameter pair constructor to create two pairs:
a char/int pair and a string/double pair. Then we display the first
and second components of each.
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The char/int pair:      A 65
The string/double pair: John 99.95
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Next we create three empty pair objects using the default constructor for
each: a char/int pair, a string/double pair, and an int/int pair. Then we
create appropriate pair objects and assign them to these empty objects.
The first two are created using the make_pair function, and the last is
created using the two-parameter constructor once again.
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The char/int pair:      B 66
The string/double pair: Jack 99.99
The int/int pair:       25 77
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Finally, we use the copy constructor to create copies of two pairs used
previously, and then display them once again.
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A char/int pair seen above:      B 66
A string/double pair seen above: Jack 99.99
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