http://www.webdevelopersnotes.com/tutorials/javascript/global_local_variables_scope_javascript.php3
http://www.kodejava.org/browse/4.html ( bole juga )
http://www.javacoffeebreak.com/books/extracts/javanotesv3/c10/ex-10-3-answer.html
http://www.javacoffeebreak.com/books/extracts/javanotesv3/index.html ( asik juga ni )
http://gd.tuwien.ac.at/languages/c/programming-bbrown/c_046.htm
