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Convert UPC to ISBN

/ Published in: JavaScript
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  1. if (indexisbn.indexOf("978") == 0) {
  2.    isbn = isbn.substr(3,9);
  3.    var xsum = 0;
  4.    var add = 0;
  5.    var i = 0;
  6.    for (i = 0; i < 9; i++) {
  7.         add = isbn.substr(i,1);
  8.         xsum += (10 - i) * add;
  9.    }
  10.    xsum %= 11;
  11.    xsum = 11 - xsum;
  12.    if (xsum == 10) { xsum = "X"; }
  13.    if (xsum == 11) { xsum = "0"; }
  14.    isbn += xsum;
  15. }

URL: http://www.eblong.com/zarf/bookscan/index.html#convert

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