Time Trials

On Thursday i can up with the idea to do a timed trial aspect to my game, to do that i would have to use scanf but since my knowledge is limited, i figured out a way to call the system time so that i could get the total time from start to finish, this allowed me to make the game timed, but no time limited. I learned that void and a function name allows you to call on a custom made set of code outside of the main() , i already knew this but it was put into action for the first time. hopefully i can figure out a way to get a score sheet going,