This program illustrates the use of the STL min() algorithm (default version)
to find the minimum of two integer literal values, the minimum of two integer
values stored in simple integer variables, and (in two different ways) the
minimum of two integer values stored in a vector of integers.
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First, we find the mminimum of two integer literal values.
min(12, -3) = -3
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Next, we find the minimum of two integer
values stored in simple integer variables.
first = 7    second = 10
min(first, second) = 7
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Here are the integer values in the vector:
2 6 10 8 4
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Now we find the minimum of the first and last values
stored in the vector of integers using one approach.
min(v.at(0), v.at(4)) = 2
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Finally, we find the minimum of the first and last values
stored in the vector of integers using a second approach.
min(*v.begin(), *(v.end()-1)) = 2
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