java程式設計題目---數字處理【數字拆解(使用method)】

Write a method that computes the sum of the digits in an integer. Use the following method header:
public static int sumDigits(long n)
For example, sumDigits(234) returns 9 (2+3+4). Use a loop to repeatedly extract and remove the digit until all the digits are extracted. Write a test program thar prompts the user to enter an inter an integer and displays the sum of all its digits.

import java.util.Scanner;

public class C1
{
 public static void main(String[] args) 
 {
  Scanner input = new Scanner(System.in); 
  
  //提示使用者輸入整數
  System.out.println("請輸入整數:");
  int number = input.nextInt();
        
  //呼叫  sumDigits 並印出答案  
  System.out.println(sumDigits(number));
  
 }

 public static int sumDigits(int num )
 {
  int sum = 0;
  
  while( num > 0)
  {
   int a = num % 10; //將整數拆解成1位1位
   int b = num / 10; //拆掉一位後剩下的數字
   
   sum = sum + a ; // 將拆解後的數字加入總和
   num = b ;  
  }  
  return sum; //回傳結果  
 } 
}