: Develop a function that takes a non-negative integer n as a parameter and returns a non-negative integer containing the sum of ns digits. For example, if the input parameter n was 17239 then the output of this function should be 1 + 7 + 2 + 3 + 9 = 22 Develop a function that takes an array of integers and its size as two parameters and does the following: For elements of the array with odd indices, the function should reverse their sign (e.g., if the element was 37, it becomes -37; if the element of the array was -5, it becomes 5). For elements with even indices, the function sets them to zero. All in C and C++