To print sum of digits:

1. 1.   To print sum of digits:
   2. public class SumOfDigits {
   3. public static void main(String[] args) {
   4. int num = 67;
   5. System.out.println(getSumOfDigits(num));
   6. }
   7. 
      
   8. public static int getSumOfDigits(int num) {
   9. 
      
   10. int sum = 0;
   11. if(num<0)
   12. {
   13. return -3;
   14. }else if(num>99){
   15. return -2;
   16. }else if(num>0&&num<9){
   17. return -1;
   18. }
   19. while (num > 0) {
   20. int rem = num % 10;
   21. sum = sum + rem;
   22. num = num / 10;
   23. }
   24. return sum;
   25. }
   26. }
   Output:
   13