Checksum. The International Standard Book Number (ISBN) is a 10-digit code that uniquely specifies a

Checksum. The International Standard Book Number (ISBN) is a
10-digit code that uniquely specifies a book. The rightmost digit is a checksum
digit that can be uniquely determined from the other 9 digits, from the
condition that d1 + 2d2 +3d3 + … + 10d10
must be a multiple of 11 (here di denotes the ith digit from the right). The
checksum digit d1 can be any value from 0 to 10. The ISBN convention is to use
the character ‘X’ to denote 10. As an example, the checksum digit corresponding
to 020131452 is 5 since 5 is the only value of x between 0 and 10 for which

»

Checksum. The International Standard Book Number (ISBN) is a
10-digit code that uniquely specifies a book. The rightmost digit is a checksum
digit that can be uniquely determined from the other 9 digits, from the
condition that d1 + 2d2 +3d3 + … + 10d10
must be a multiple of 11 (here di denotes the ith digit from the right). The
checksum digit d1 can be any value from 0 to 10. The ISBN convention is to use
the character ‘X’ to denote 10. As an example, the checksum digit corresponding
to 020131452 is 5 since 5 is the only value of x between 0 and 10 for which

is a multiple of 11. Write a program that takes a 9-digit
integer as a command-line argument, computes the checksum, and prints the ISBN
number.

»

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