java，

java，

import java.util.Scanner;

import javax.swing.JOptionPane;

public class javpro {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		JOptionPane.showMessageDialog(null,
				"Enter a number between 0 and 1000: ");
		System.out.println("Enter a number between 0 and 1000: ");
		int t = input.nextInt();
		int s = 0;
		while (t>0) {
			int a = t % 10;
			t = t / 10;
			s = s + a;
		}
		System.out.println("The sum of the digits is " + s);

	}

}