ISC Computer Science Practical 2013

An ISBN ( International Stanadar Book Number) is a ten digit code which uniquely identifies a book. The first nine digits represent the Group, Publisher and Title of the book and the last digit is used to check whehter ISBN is correct or not. Each of the first nine digits of the code can take a value between 0 and 9. Sometimes it is necessary to make the last digit equal to ten; this is done by writing the last digit of the code as X. 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 final number leaves no remainder when divided by 11, the code is a valid ISBN. 

For example:

Example 1

INPUT CODE : 0201530821

OUTPUT : SUM = 99

LEAVES NO REMAINDER - VALID ISBN CODE

Example 2

INPUT CODE : 035680324

OUTPUT : INVALID INPUT

Example 1

INPUT CODE : 0231428031

OUTPUT : SUM = 122

LEAVES REMAINDER - INVALID ISBN CODE

ISC 2013 ~ Computer Science Practicals