When I give my function declaration or definition is there any difference whether or not I put void in the parameter list or if I just use empty parenthesis? I know both will compile. But is there any larger reason to put the second void in there in the definition or declaration?
Unfortunately I'm far from being a C/C++ expert, I like hardware much better. I think the use of void function_name(void) is the formal method but void function_name() seems to be an acceptable default. I would bet that varies with the C/C++ standard the compiler is working with and most likely has changed over time and newer compiler standards. But wait for a real expert to know for sure. In the mean time use what works is my motto. 
Lefty