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ISBN Program - Java Programs

The International Standard Book Number (ISBN) is a unique numeric book identifier which is printed on every book. The ISBN is based upon a 10-digit code.

The ISBN is legal if: 1 × digit1 + 2 × digit2 + 3 × digit3 + 4 × digit4 + 5 × digit5 + 6 × digit6 + 7 × digit7 + 8 × digit8 + 9 × digit9 + 10 × digit10 is divisible by 11.

Example: For an ISBN 1401601499, sum = 1 × 1 + 2 × 4 + 3 × 0 + 4 × 1 + 5 × 6 + 6 × 0 + 7 × 1 + 8 × 4 + 9 × 9 + 10 × 9 = 253 which is divisible by 11.

Write a program to:

(i) Input the ISBN code as a 10-digit integer.

(ii) If the ISBN is not a 10-digit integer, output the message “Illegal ISBN” and terminate the program.

(iii) If the number is divisible by 11, output the message “Legal ISBN”. If the sum is not divisible by 11, output the message “Illegal ISBN”.

Java


import java.util.Scanner;
class ISBN{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.print("Enter ISBN Number: ");
        long isbn = Long.parseLong(in.nextLine());
        int count = 0;
        for(long i = isbn; i != 0; i /= 10)
            count++;
        if(count != 10){
            System.out.println("Illegal ISBN");
            return;
        }
        int sum = 0;
        for(int i = 10; i >= 1; i--){
            int d = (int)(isbn % 10);
            sum += d * i;
            isbn /= 10;
        }
        if(sum % 11 == 0)
            System.out.println("Legal ISBN");
        else
            System.out.println("Illegal ISBN");
    }
}

Output

 
 OUTPUT 1: 
Enter ISBN Number: 1401601499
Legal ISBN 

 OUTPUT 2: 
Enter ISBN Number: 1401601699
Illegal ISBN