Java 電話客服中心

題目:電話客服中心

import java.util.Scanner;

public class IdAuthentication{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str;
  
        while( sc.hasNext() ){
            str = sc.nextLine();
            char c[] = str.toCharArray();
   
            int sum = 0;
            for(int i = 0; i < 8; i++ ){
                sum += (c[i]-48)*(8-i);
            }
            sum += (c[8]-48);
   
            int n;
            for(int a = 65; a <= 90; a++){
                if( a == 88 || a == 89 ){
                    n = a - 58;
                }
                else if( a >= 65 && a <= 72 ){
                    n = a - 55;
                }else if( a >= 74 && a <= 78){
                    n = a - 56;
                }else if( a >= 80 && a <= 86){
                    n = a - 57;
                }else{
                    n = (a == 73) ? 34 : (a == 79) ? 35 : 
                        (a == 87) ? 32 : (a == 90) ? 33 : a;
                }
                if( (sum + (n/10) + ((n%10)*9))%10 == 0 ){
                    System.out.print((char)a);
                }
            }
            System.out.println();
        }
    }
}