Thread: Rookie here, need help with sum of digits program

I am completely new to java and am very lost on a current program I am working on. I cannot figure out what code to add in or use when it comes to extracting the digits using an operator.

Here is my instructions:

Write a program that reads an integer from 0 to 999 from the keyboard and then adds up all the digits in the integer. For example, if the integer is 735 then the sum of the digits is 7+3+5=15.

(This is the current code I have so far) Any help is appreciated.

1  import java.util.Scanner;
2   /**
3  *
4  * @author willkellogg
5  */
6  public class SumDigits {
7     public static void main(String[] args) {
8     Scanner input = new Scanner(System.in) ;
9     
10      //input
11      System.out.println("Enter a number from 0 to 999: ") ;
12      double digit1 = input.nextDouble() ;
13      double digit2 = input.nextDouble() ;
14      double digit3 = input.nextDouble() ;
15      
16      //process
17      double average  = (digit1 + digit2 + digit3) / 3 ;
18      
19     
20      //output
21      System.out.println("The sum of the digit is " + digit1 + "" + digit2 + "" 
22                          + digit3 + "is" + average) ;
 
 
 
      }
}

.