A "sum" method which takes another IntVector as a parameter, and returns a new IntVector which is the element-wise sum of the two original objects. For example, if an IntVector object contains the integers { 4, 10, 7, 2 }, and you call "sum" passing as an argument another IntVector which contains { 1, 2, 3, 4 }, the result should be an IntVector which contains { 5, 12, 10, 6 }. This method will have to check to make sure the arrays in the invoking object and the parameter have the same length.
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