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Language/Type: C++ recursion return
Author: Eric Roberts (on 2016/06/16)

Write a recursive function named digitSum that accepts an integer as a parameter and returns the sum of its digits. For example, calling digitSum(1729) should return 1 + 7 + 2 + 9, which is 19. If the number is negative, return the negation of the value. For example, calling digitSum(-1729) should return -19.

Constraints: Do not declare any global variables. Do not use any loops; you must use recursion. Do not use any auxiliary data structures like vector, map, set, array, etc. Also do not solve this problem using a string. You can declare as many primitive variables like ints as you like. You are allowed to define other "helper" functions if you like; they are subject to these same constraints.

Function: Write a C++ function as described, not a complete program.

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