题解 | 求四位数各个数位之和

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
       //以字符串读取这个数字n
       String number=scanner.next();
      int sum=0;
      //遍历每一位，然后相加
      for(int i = 0;i<number.length();i++){
      sum+=number.charAt(i)-'0';
      }
      System.out.println(sum);
     scanner.close();
        }
}