题解 | 数位之和

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        n = Math.abs(n);
        String s = String.valueOf(n);
        int res = 0;
        for (int i = 0; i < s.length(); i++) {
            res += s.charAt(i) - '0';
        }
        System.out.print(res);
    }
}