Sum of Digits

Given a number the task is to calculate the sum of digits.

Example: 253. 2+5+3 = 10.

C
import java.util.*;
class SumDigits
{
    public static void main(String args[])
    {
        int n=0,r=0,sum=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a number: ");
        n=sc.nextInt();
        while(n>0)
        {
            r=n%10;
            sum=sum+r;
            n=n/10;
        }
        System.out.println("Sum of digits is "+sum);
    }
}
C