ISBN 号码（java）

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        char mod[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'X'};
        String s = scanner.nextLine();//可以输入空白next()也可以
        int a = 1;
        int zhi = 0;
        for (int i = 0; i < 11; i++) {
            if (s.charAt(i) == '-') {
                continue;
            }
            zhi += (s.charAt(i) - '0') * a++;//转换计算
        }
        if (mod[zhi % 11] == s.charAt(12)) {
            System.out.println("Right");
        } else {
            String r = s.substring(0, 12) + mod[zhi % 11];//String substring 来截取长度
            System.out.println(r);
        }
    }
}