yes It works!! Thanks.. I still confuse her and then when use the SET == and the Equal = is applied. Thanks very much! Also.. Can you comment what is best practice
If[! $SystemWordLength == 64, 32, 64]
(*or*)
If[! ($SystemWordLength == 64), 32, 64]
(*or*)
If[(! $SystemWordLength == 64), 32, 64]