Segment Display Voltmeter Help

Trying to put together a 0-30V variable AC->DC power supply. Also trying to put together a lot of new knowledge: mainly need some help with the arduino as detailed here haha:

Welcome to the Forum. Please read the two posts at the top of this Forum by Nick Gammon on guidelines for posting here, especially the use of code tags ("</>") when posting source code files. Also, before posting the code, use Ctrl-T in the IDE to reformat the code in a standard format, which makes it easier for us to read.