The "partial sum" of an array is the sum of all the elements from position 0 to position n in the array. For example, the partial sum of the array {3, 4, 2} is {3, 7, 9} (the 7 is the result of 3+4, the 9 is the result of 3+4+2). Write a method that accepts an array of integers and returns the array of partial sums.