isbn12转isbn13

import java.util.Scanner;
public class eight {
    public static void main (String[] args){
    Scanner in = new Scanner(System.in);
        System.out.print("输入12位的ISBN码：");
        String isbn = in.next();
        int count=0;
        int amount=Integer.parseInt(isbn);
            int countEven = 0;
            int countOdd = 0;
            for (int i = 0; i < 12; i++) {
                int c = isbn.charAt(i);
                    if (i%2== 0)
                        countOdd += c;
                    else
                        countEven += c;
            }
            count = countOdd+(countEven * 3);
            int count1=10-count%10;
            if(count1==10)
                System.out.println("ISBN-13的码是"+isbn+"0");
            else
                System.out.println("ISBN-13的码是"+isbn+count1);
        
    }
}