void big_delay(void);
void big_delay(void) <----where's the semicolon? Why do the prototype twice?


What is this?

flaoat ahfinal = 0.0000;

should be

float ahfinal = 0;


There's probably a handful of other errors! If the compiler complains about something that looks legal, look above for errors. Could you please spend a little more time checking your work before posting in on a forum. You need to learn. It is too easy to ask a question on a forum - don't be lazy.