2.6

java.util.Scanner;
public class Demo_1{
    public static void main(String[] agrs) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a number 0 and 1000: ");
        int number = input.nextInt();
        int numbera = number % 10;
        int numberb = number / 10;
        int numberc= numberb % 10;
        int numberd= numberc % 10;
       
        int sum = numbera  + numberc + numberd;
        System.out.println("The sum of the digits is " + sum );
    }
}

2.6

原文：http://www.cnblogs.com/jingjing1314/p/7542457.html