Computers and Technology, 21.04.2020 21:02 taten1701
Write a program that accepts an ISBN number and displays whether it is valid or not. An ISBN (International Standard Book Number) is a ten digit code which uniquely identifies a book. The first nine digits represent Group, Publisher and Title of the book and the last digit is used as a checksum (to check whether the given ISBN is valid). Each of the digits can take any value between 0 and 9. In addition, the last digit may also take a value X (stands for 10). To verify an ISBN, calculate 10 times the first digit, plus 9 times the second digit, plus 8 times the third and so on until we add 1 time the last digit. If the number 11 can divide the sum (no remainder), the code is a valid ISBN.
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Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.
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Write a program that accepts an ISBN number and displays whether it is valid or not. An ISBN (Intern...
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