How to write codes using arduino for automatic paper vending machine?????

Answer 1

The Arduino language is merely a set of C/C++ functions that you call from your code:
https://www.arduino.cc/en/Main/FAQ

So it's an API of sorts. Choose a language that can make API calls (probably not html, your tag)

More info on internals:
https://www.arduino.cc/en/Hacking/BuildProcess

Implementation is specific to the task, and you're in the best position to break that down into what has to happen. For example, what are the engineering concerns for the pickup rollers? While the paper is traveling? Paper weight? Media types (paper and not paper)? Does Arduino monitor these? Do you adjust for temperature and humidity? [That's just a few sensor/motor questions, not even the main code, interface, etc yet.]

Answer 2

Thanks a lot...am currently working for my final year project...this Wil help me to write the codes....but I'm new to arduino programming..so I struggled to write codes for arduino