I just thought I'd say this to Aelx Stivala:


Wednesday October 11 1995 19:52, Alex Stivala wrote to Steven Pasztor:


 sp>> Someone must of needed to do this sometime:
 sp>> Anyone know how to validate the ISBN numbers from books?  I
 sp>> urgently nee the algorithm for validating an input field in one of
 sp>> my programs, but ca find it anywhere.
 AS> ISBNs have 10 digits. The first digit indicates language (English
 AS> is 0). Next two digits indicate publisher. Next six digits are the
 AS> book number assigned by the publisher. The last digit is a weighted
 AS> checksum designed to detect any single digit error or any single
 AS> transposition error. It is calculated to satisfy
 AS> Source: Raymond HILL, 1986, A First Course in Coding Theory, OUP
 AS> ISBN 0-19-853803-0 (try it out :-) )

 Aye, it does work...  And very nicely too, I might add.  :-)

 The actual application it ended up in was a dBASE III+ program...  A
little like C, if you're VERY imaginative!  But, that's life...


 AS>         \sum_{i=1}^{10} ix_i \equiv 0 \pmod{11}

 I'm curious to know of the format used here...  It's reminesent (sp?) of
what would be generated by an equation drawing program, with the equation
saved in "Rich Text Format" or an equivelant thereof...


nevets


... FiShInG rOd: A hOoK aT oNe EnD, a FoOl At ThE oThEr.
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