An applet that takes a expresion like: a+b+([f*g]/{r-h})-[(e/{f+(d*g)})] to analizes and tells if it s valid or have a sintactic error like ( without )-An applet that takes a expresion like: a+b+([f*g]/{r-h})-[(e/{f+(d*g)})] to analizes and tells if it s valid or have a sintactic error like　(　without　)