蓝桥杯算法提高VIP-身份证号码升级-题解（Java代码）

import java.util.Scanner;
public class 测试2 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        String a=scanner.nextLine();
        StringBuffer a1=new StringBuffer();
        int []b={7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};//每位要乘的系数
        char []c={'1','0','x','9','8','7','6','5','4','3','2'};//验证码
        int sum=0;
        a1.append(a);
        a1.insert(6, 19);//把19添加到第六位后面
    for (int i = 0; i < a1.length(); i++) {
        sum+=(a1.charAt(i)-48)*b[i];//每位乘系数的和
    }
    a1.append(c[sum%11]);//添加验证码
    System.out.println(a1);
    }
    }