guys I gut this question please clarify it to me.

i actually open the Stepper.h and stepper.ccp file that is being supplied with the arduino IDE but i dont understand it. could someone be kind enough to clarify it for me.

what im wondering is what does this mean?

this->

http://www.fredosaurus.com/notes-cpp/structs/arrow.html

it means "The instance variable, not the local variable"

'this->' is a pointer to the object (class instance) that the code is running in.

thanks guys. now i know what it means.