[omalleyj]

Those variables are not predefined in EasyC. You need to either define them as a local variable, if you are only using them in one function, or globally if you use it in several functions.
Most likely you want to have them available anywhere in the program, so define them globally. Press F6 to pop up the global variables section and add a variable to the list at the bottom. Probably you will want an 'unsigned char', as joysticks use 0-255, but you may want an 'int' if you plan to do math on the value and the variable may end up holding a negative value.