题解 | 数位之和

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        if(n<=0)n = n*(-1);
        int sum = 0;
        while(n!=0){
            sum += n%10;
            n/=10;
        }
        System.out.println(sum);
    }
}