Problem 1: Check ISBN-10 Number

An ISBN-10 (International Standard Book Number) consists of 10 digits: d1d2d3d4d5d6d7d8d9d10. The last digit, d10, is a checksum, which is calculated from the other nine digits using the following formula:

(d1 * 1 + d2 * 2 + d3 * 3 + d4 * 4 + d5 * 5 + d6 * 6 + d7 * 7 + d8 * 8 + d9 * 9) % 11 If the checksum is 10, the last digit is denoted as X according to the ISBN-10 convention.

Write a Java program that prompts the user to enter the first 9 digits and displays the 10-digit ISBN (including leading zeros).

You have to solve this problem using loops.

Sample Input/Output

Enter the first 9 digits of an ISBN: 013601267 The ISBN-10 number is 0136012671 

Enter the first 9 digits of an ISBN: 013031997 The ISBN-10 number is 013031997X 

Enter the first 9 digits of an ISBN: 0135042