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if (isbn.length() == 13 && isbn.indexOf("978") == 0) { isbn = isbn.substring(3,12); int xsum = 0; for (int i = 0; i < 9; i++) { } xsum %= 11; xsum = 11 - xsum; switch (xsum) { case 10: x_val = "X"; break; case 11: x_val = "0"; break; } isbn += x_val; }
URL: http://www.eblong.com/zarf/bookscan/eantoisbn-java.txt