Question

alternate

//声明变量

import java.util.Scanner;

//检查isbn数字的长度

public class ISBNChecker {
public static void main(String [] args) {
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Please enter a 13 digit book number:");
    String book = keyboard.nextLine(); 
    int isbn = Integer.parseInt(book);

//检查每1,3,5,7,9,11和13号的数字是否乘以3，每隔一个数字乘以1，然后将它们加在一起

    if (book.length() != 13) {
        System.out.println("ILLEGAL ISBN NUMBER");
    }

}

    for(int i = 0; i < book.length(); i++){
        char c = book.charAt(i); //get the current char
        int value = c - '0'; //subtract '0' from the char
        isbn += value * (i+1);

//the rest is to see if total of isbn is dividable by 10 to have no remains

    }
    if ((isbn % 10) != 0) {
        System.out.println("Illegal ISBN number");
    } else {
        System.out.println("It's an ISBN number");
    }
}

//the problem with this code is that it won't work and I am pretty sure I messed up the format. Please help me check. 
// when I process it. this error shows up :

Answer 1

这个数字太大而无法融入整数。请尝试使用Long代替..

Max Integer是2147483647。

Max Long是9223372036854775807L。

我的isbn检查器中的错误是什么？

1 个答案: