Question

Description: An ISBN-10 (International Standard Book Number) consists of 10 digits: didzdzdad5d6d7d8d9d1o. The last digit, dio, is a checksum, which is calculated from the other nine digits using the following formula: (d, x 1 + d2 x 2 +d3 x 3 + da x4 + ds x 5 + de x 6 + d7 x 7+ d3 x 8+dex 9) % 11 If the checksum is 10, the last digit is denoted as X according to the ISBN-10 convention. Write a program that prompts the user to enter the first 9 digits and displays the 10-digit ISBN (including leading zeros). Input: Your program should prompt for input as shown below. Your program should terminate after a single input; this is showing 2 separate executions. (Note there is a return at the end of the last line; bold indicates output line(s)) Enter the first 9 digits of an ISBN as integer: 913601267 The ISBN-10 number is 0136012671 Enter the first 9 digits of an ISBN as integer: 013031997 The ISBN-10 number is 013031997X Output: Output the solution as shown in the examples above

Answer 1

// In java

import java.util.Scanner;

public class ISBN {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        //Initializing count to 1
        int count = 0;

        // Reading input
        System.out.print("Enter the first 9 digits of an ISBN-10 as a string: ");
        String s = scan.nextLine();

        //looping through each digit of the input
        for(int i = 1;i<10;i++){
            //Counting dx*x for digit dx
            count += (i*(s.charAt(i-1)-'0'));
        }
        // Calculating the reminder
        count = count % 11;

        // If count is less than 10 then appending reminder at the end
        if(count<10){
            s += count;
        }
        // If count is greater than or equals to 10 then appending X at the end
        else{
            s += "X";
        }

        // Printing the final value of s
        System.out.println("The ISBN-10 number is "+s);
    }
}

$\color{blue}\underline{Output:}$

Enter the first 9 digits of an ISBN-10 as a string: 013601267 The ISBN-10 number is 0136012671 Process finished with exit code 0,

Enter the first 9 digits of an ISBN-10 as a string: 013031997 The ISBN-10 number is 013031997X Process finished with exit code 0

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