Several have reported a slight quagmire [or don't know they've stepped in it yet] in the last series of lectures.
Did I move too fast? Did I leave something out? Need clarification? Is it time for a general review , using byte-sized programs to demonstrate C syntax to reinforce what you know and/or to clarify any questions that you have or don't know you have, before we get into debugging the code with the IDE's built-in debugger?
------------------
Allen Moulton from Uechi-ryu Etcetera