thank you sir mack, joe and ace.. i'll try to study what you have told me. can i ask 1 more thing? u know how to translate this equation into picbasic pro codes: x = 2 * 1.5.. i tried to do this but the result was x = 2 only.. it means only the equation x = 2 * 1 was seen by the program.. anyone can help.. thnx!