Arduino Romeo uses C or C++?

Exactly what code does the Arduino Romeo run on? I’ve been using it for a few months now, but when I consulted a C++ user’s guide, the Arduino code didn’t quite seem to match up. Is there an Arduino book out there for sale that would help?
Specifically, I’m trying to break out of a void loop (void) statement, and replace it with a for loop, with a break statement. I’m not able to find the “loop” statement in the C++ book I have. Any help would be appreciated.

The ROMEO is intended to run Arduino software, which is not exactly C. You will find many examples on the Arduino website, including the FOR loop.