Java Program to find Sum of Digits

1. Java Program to find sum of digits without using recursion.

1. package com.instaceofjava;
2. import java.util.Scanner;
3.  
4. public class SumOfDigits {
5.  
6. public static void main(String[] args) {
7.  
8. int number;
9. Scanner in = new Scanner(System.in);
10.  
11. System.out.println("Please Enter a number");
12.  
13. number=in.nextInt(); 
14.  
15. int sum=0 ;
16.  
17. while(number!=0){
18.  
19. sum=sum+(number%10);
20. number=number/10;
21. }
22.  
23. System.out.println("Sum of Digits ="+sum);
24.  
25. }
26. }

Output:

1. Please Enter a number
2. 123
3. Sum of Digits=6

2. Java Program to find sum of digits using recursion.

1. package com.instaceofjava;
2. import java.util.Scanner;
3.  
4. public class SumOfDigits {
5.  
6. int sum;
7. 
   
8. public int CalRecSum(int n){
9.  
10. if(n==0){
11. return sum;
12. }
13. else{
14.  
15.  sum+=n%10;
16.  CalRecSum(n/10);
17.  
18. } 
19.  
20. return sum;
21. }
22. 
    
23. public static void main(String[] args) {
24.  
25. int number;
26. Scanner in = new Scanner(System.in);
27.  
28. System.out.println("Please Enter a number");
29.  
30. number=in.nextInt(); 
31.  
32. SumOfDigits   ob= new SumOfDigits();
33. System.out.println("Sum of Digits ="+ob.CalRecSum(number));
34.  
35. }
36.  
37. }

Output:

1. Please Enter a number
2. 326
3. Sum of Digits=11