Exercise : digitSum

• Write a method named digitSum that accepts an integer as a parameter and returns the sum of the digits of that number. For example, the call digitSum(29107) returns 2+9+1+0+7 or 19. For negative numbers, return the same value that would result if the number were positive. For example, digitSum(-456) returns 4+5+6 or 15. The call digitSum(0) returns 0.
• (Hint: This is a cumulative algorithm. To extract a digit from a number, use / 10 and % 10 operations.)
• Try solving this problem in Practice-It! using the link above.