So I'm starting a C++ class next week in college and I decided today to have a go at writing a simple program in Xcode (Just a Hello, World! one). I went to "new file" in Xcode and chose C++ syntax highlighting and wrote it.. Now, I think it needs to be complied before it will run, and I don't know how to do that. I've tried lots of different things and googled around for a good while and couldn't get any answers. So, what do I have to do to get this to run and/or compile?