This program illustrates the use of the STL accumulate() algorithm (default
version) from <numeric> to find the sum of integer values stored in a vector.
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Here are the integer values in the vector:
2 4 6 8 10
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The sum of these values is 30.
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The sum of the middle three values and an intial value of -5 is 13.
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The sum of the values in an empty range, with an intial value of 22, is 22.
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