This program illustrates the use of the STL max() algorithm (extended version)
to find the maximum of two integer literal values, the maximum of two integer
values stored in simple integer variables, and (in two different ways) the
maximum of two integer values stored in a vector of integers. In this case,
one integer is larger than another if and only if it has a greater digit sum.
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First, we find the maximum of two integer literal values.
max(16, 23) = 16
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Next, we find the maximum of two integer
values stored in simple integer variables.
first = 7    second = 10
max(first, second) = 7
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Here are the integer values in the vector:
39 66 110 81 47
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Now we find the maximum of the first and last values
stored in the vector of integers using one approach.
max(v.at(0), v.at(4)) = 39
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Finally, we find the maximum of the first and last values
stored in the vector of integers using a second approach.
max(*v.begin(), *(v.end()-1)) = 39
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