Chapter 3, Problem 3.9PE

(Business: check ISBN-10) 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 9 digits using the following formula:

     $\left(d_1\times 1+d_2\times 2+d_3\times 3+d_4\times 4+d_5\times 5+d_6\times 6+d_7\times 7+d_8\times 8+d_9\times 9\right)\%11$

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). Your program should read the input as an integer. Here are sample runs: