(Business: check ISBN-13) ISBN-13 is a new standard for identifying books. It
uses the 13 digits
is a checksum, which is calculated from the other digits using the following formula:
If the checksum is 10, replace it with 0. Your program should read the input as a string. Here are sample runs:
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.