ISBN Check Digit
The check digit for ISBN is found as the result of taking modulo 11. Since this could give 11 possible results, the digit "X" is used in place of "10".
Read more about this topic: Undecimal
Famous quotes containing the words check and/or digit:
“This fellow is wise enough to play the fool,
And to do that well craves a kind of wit.
He must observe their mood on whom he jests,
The quality of persons, and the time,
Not, like the haggard, check at every feather
That comes before his eye. This is a practice
As full of labor as a wise man’s art.”
—William Shakespeare (1564–1616)
“Bless my soul, Sir, will you Britons not credit that an American can be a gentleman, & have read the Waverly Novels, tho every digit may have been in the tar-bucket?”
—Herman Melville (1819–1891)