dividing program into parts

I've given an assignment about gpa calculator. I've done the assignment with 400 lines of coding. Now I need to divide the assignment(coding) into 4 individual parts. can anyone Help me on it.
Im not sure if you want to do it in different classes with files, or just with functions. Either way, Im gonna provide you a few videos that will help you.

Video 9,10,11 are for functions.
12,13, 15 are the ones you want to watch if you want to split them into different files.
bro thank you but i've seen so many videos on youtube but i still can't do it. I got the whole program done. Now they want me to do it part by part. I mean the function. Then combine all those 4 parts into 1 but i've already got the combined part(the whole coding). can you help me to do the individual parts.
Since you asked very nicely and allegedly finished it on your own, I'll help you out. PM me your skype.
In the future, don't carry on public discussion in private. It makes this topic useless for people who find it by searching.
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