ISBN Checker Program Assignment for CS 140 - Prof. Andrew R. Dalton, Assignments of Computer Science

Download ISBN Checker Program Assignment for CS 140 - Prof. Andrew R. Dalton and more Assignments Computer Science in PDF only on Docsity! CS 140 Fall 2008 Assignment #6: Book Numbers Dr. Andrew R. Dalton October 17th, 2008 1 Overview The purpose of this assignment is to give you some experience working with the functions printf and scanf, variables of type int and char, arithmetic operators, for loops, and if statements. An International Standard Book Number (ISBN) is a unique identifier printed on most books. The identifier consists of 10 symbols (9 numeric digits and 1 check symbol)1. The check symbol is used to detect (some, but not all) errors if one or more of the 9 digits are incorrect. For this assignment, you will develop a program that will check ISBN identifiers for accuracy. Your program will read an ISBN identifier, compute the check symbol based on the first 9 numbers, and verify that the entered check symbol (the 10th symbol) is correct. Example runs of your program might look like: $ ./a.out Enter the 10-symbol ISBN code: 0672326663 The entered ISBN appears to be correct. $ $ ./a.out Enter the 10-symbol ISBN code: 080442957X The entered ISBN appears to be correct. $ $ ./a.out Enter the 10-symbol ISBN code: 055285810X Check symbol mismatch. The entered ISBN is incorrect. Entered check symbol: X Computed check symbol: 2 $ $ ./a.out Enter the 10-symbol ISBN code: 0684324314 Check symbol mismatch. The entered ISBN is incorrect. Entered check symbol: 4 Computed check symbol: 8 $ The program should be saved in a file named isbn.c. 2 Details Your program should read the 10-symbol ISBN identifier one symbol at a time. The first 9 symbols will be numbers, the last symbol will be either a number or an ‘X’. Notice that you cannot read the first 9 symbols as integers – together they would appear to be one large integer! You must first read them as characters and 1On January 1st, 2007 the 10-symbol code was replaced by a 13-symbol code. In this assignment, however, we will be working with the older 10-symbol code. 1