Chapter 3, Problem 35PE

(Business: check ISBN-10) An lSBN-10 (International Standard Book Number) consists of 10 digits: $d_1{d}_2{d}_3{d}_4{d}_5{d}_6{d}_7{d}_8{d}_9{d}_{10}.$ The last digit, $d_{10},$ is a checksum, which is calculated from the other nine digits using the following formula:

$\begin{array}{l}(d_1\times 1+d_2\times 2+d_3\times 3+d_4\times 4+d_5\times 5+d_6\times 6+d_7\times 7\\ +d_8\times 8+d_9\times 9)\%11\end{array}$

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.