Exercise 5. This software calculates
the ISBN check digit. Use it to verify that 0395872456 is valid.
Now enter the same
number with one digit incorrect. Was the error detected? Enter the number
with two digits transposed. Was the
error detected?
Exercise 6. This software determines the two check
digits for the mod 11 decimal error correction
scheme
discussed in this chapter. Run the program with the
input 21355432, 20965744, 10033456. Then enter these numbers with the two check digits
appended with one digit incorrect. (Please type in 'x' instead of '10' for the check
digits.)