60页2.6 （第二次作业）

import java.util.Scanner;  
  
public class A {  
    public static void main(String[] args){  
        Scanner input = new Scanner(System.in);  
        int sum;  
            
        System.out.println("Enter a number between 0 and 1000: " );  
        int num = input.nextInt();  
           
        if(num <= 99){         
            int num1 = num % 10;  
            int num2 = num / 10;  
            sum = num1 + num2;  
        }  
        else {  
            int num1 = num % 10;         
            int num2 = num % 100 / 10;  
            int num3 = num / 100;         
            sum = num1 + num2 + num3;  
        }  
          
          
        System.out.println("The sum of the digits is " + sum);  
    }  
  
}