I'm working on a simple elevator with arduino and i have problems about how to control a DC motor (connected to elevator room) and a LCD that show floor number.
i found the code so hard to make.
thank you for help 
i found the code so hard to make.
But, you tried. And the code did something. You expected something. All that is obvious is that what the code actually did was not what you expected.
thank you for help
You are most welcome.
You can get plenty of help here but if you had read this before posting a programming question you would know that more detail is required.
Post your code following the advice the the link above.
Describe the problems that you are having.
If you get error messages then post them in full.
How is the motor connected to the Arduino ?
How is the motor powered ?