Write a Java program in which a method named digitSum that a

Write a Java program in which 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

Solution

DigitSumTest.java

import java.util.Scanner;

public class DigitSumTest {

   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.print(\"Enter an integer: \");
       int n = scan.nextInt();
       int sum = digitSum(n);
       System.out.println(\"The sum of digits is \"+sum);
   }
   public static int digitSum (int n) {
         
       int sum = 0;
       if(n == 0){
           return 0;
       }
       else if(n < 0){
           n = -n;
       }
       do {
       sum += n % 10;
         
       } while ((n = n / 10) != 0);
         
       return sum;
       }
}

Output:

Enter an integer: -456
The sum of digits is 15

Enter an integer: 29107
The sum of digits is 19