算法提高 身份证号码升级

import java.util.Scanner;2
public class Main { 3
public static void main(String[] args){4
  Scanner sc=new Scanner(System.in);5
  char []a={'1','0','x','9','8','7','6','5','4','3','2'};6
  int[] c={7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};
7
  String s=new String();8
  s=sc.nextLine();9
  char[] ch=s.toCharArray();//char []ch1=sc.next().toCharArray();
10
  char[] c1=new char[20];11
  System.arraycopy(ch, 0, c1, 0, ch.length);12
  for(int i=14;i>=6;i--){13
    c1[i+2]=c1[i];14
  }15
  c1[6]='1';16
  c1[7]='9';17
  int sum=0;18
  for(int i=0;i<=16;i++){19
    sum+=(int)(c1[i]-'0')*c[i];//字符-‘0’表示将字符转换为数字20
  }21
  sum%=11;22
  for(int i=0;i<17;i++)23
    System.out.PRint(c1[i]);24
  System.out.println(a[sum]);25
}26
}27
​