LCD/Joystick Menu

Hi! I'm new to the Arduino world. And I need to create a menu that I can navigate through and acceses different functions. For example, showing the temperature or humidity in the room (that needs to be selected from the menu ). I tried to build a code using switch and cases in order to sketch a "tree" of choices but apparently it only accepts integer parameters and the values read from the Joystick are not integers. I want to know if anyone tried any sorts of projects regarding the LCD and Joystick put togheter and if so, where should I start from?! :o

Begin by telling us why you think the joystick values are not integers. Where do the values come from?