"I notice that "return" was not used in a several function call's, why or why not use it? "
if you declare a function void (which means it doesnt return a value) then you dont put return at the end of the function otherwise compiler complains. But if you declare a function type to be int or char, you must return an int or char respectively.
Looks like your c course is either too short or you missed alot of lectures!
mahmood