题解 | 求四位数各个数位之和

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext())
        {
            int n=sc.nextInt();
            System.out.println(n%10+n%100/10+n%1000/100+n/1000);
        }
    }
}