You only have one main() function. The project requires three additional functions:

Your program should at least have the following functions:-
i. Function Average_Calculation – to calculate average mark
ii. Function Status – to determine the status.
iii. Function Display – display the result

>> blablabla... still error and error

And that is supposed to mean something? It looks like you don't care. Where is your code for the three functions Average_Calculation(), Status() and Display()?