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Convert UPC to ISBN

/ Published in: Java
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  1. if (isbn.length() == 13 && isbn.indexOf("978") == 0)
  2. {
  3.   isbn = isbn.substring(3,12);
  4.   int xsum = 0;
  5.  
  6.   for (int i = 0; i < 9; i++)
  7.   {
  8.       xsum += (10 - i) * Character.getNumericValue(isbn.charAt(i));
  9.   }
  10.  
  11.   xsum %= 11;
  12.   xsum = 11 - xsum;
  13.  
  14.   String x_val = String.valueOf(xsum);
  15.  
  16.   switch (xsum)
  17.   {
  18.       case 10: x_val = "X"; break;
  19.       case 11: x_val = "0"; break;
  20.   }
  21.  
  22.   isbn += x_val;
  23. }

URL: http://www.eblong.com/zarf/bookscan/eantoisbn-java.txt

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