ISBN-10 is a standard for identifying books. It uses 10 digits d?dzd3dadsdsdzdsd

Question

ISBN-10 is a standard for identifying books. It uses 10 digits d?dzd3dadsdsdzdsdsd?e. The last digit d?e is a checksum which is calculated from the other digits using the following formula: If the checksum is 10, the last digit is denoted as X according to the ISBN-10 convention. Write a Java class, ISBN, that prompts the user to enter an ISBN-10 number as a string, and then reports if the string is valid by verifying the checksum. Your program should read the input as a string, and then use a loop to compute the checksum, and verify that the 10th digit matches with the computed checksum. Here are some sample runs: Enter an ISBN-10 number: 0136012671 This is a valid ISBN-10 number

Explanation / Answer

ISBN.java

import java.util.Scanner;

public class ISBN {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Enter an ISBN-10 number: ");

String s = scan.next();

int checkSum = 0;

for(int i=0;i<s.length()-1;i++) {

checkSum=checkSum+ (i+1)*Integer.parseInt(s.charAt(i)+"");

}

checkSum=checkSum%11;

int lastDigit = Integer.parseInt(s.charAt(s.length()-1)+"");

if(lastDigit==checkSum) {

System.out.println("This is a valid ISBN-10 number");

} else {

System.out.println("This is NOT a valid ISBN-10 number");

}

}

}

Output:

Enter an ISBN-10 number:
0136012671
This is a valid ISBN-10 number

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