csp_ 201312-2 ISBN号码（java）

这题唯一要注意的就是，一个字符想变成数字运算，那就就得 - ‘0’；

import java.util.Scanner;

public class Main {
    
    
    public static void main(String[] args) {
    
    
        Scanner input = new Scanner(System.in);
        String str = input.next();
        int sum = 0, count = 1;
        for (int i = 0; i < str.length(); i++) {
    
    
            if (str.charAt(i) == '-') {
    
    
                continue;
            }
            if (i == str.length() - 1) {
    
    
                sum = sum % 11;
                if (sum == 10) {
    
    
                    if (str.charAt(i) == 'X') {
    
    
                        System.out.println("Right");
                    } else {
    
    
                        str = str.substring(0, i);
                        System.out.println(str + 'X');
                    }
                    break;
                }
                if (sum == str.charAt(i) - '0') {
    
    
                    System.out.println("Right");
                } else {
    
    
                    str = str.substring(0, i);
                    System.out.printf("%s%d", str, sum);
                }
                break;
            }
            sum += (str.charAt(i) - '0') * count;
            count++;
        }


    }
}

原题链接：http://118.190.20.162/view.page?gpid=T4