Can you use both C++ AND BP?

Title says it all. Is it possible?

Of course. start a BP project then add a c++ class from the main menu or vise versa. Where are you lost? This is pretty basic.

Oh, I was just asking for my friend (co-developer). He seemed unsure about the possibility of using both, so I just wanted an extra confirmation. Thanks!

The blueprint functions are nothing other than C++ functions, well generally speaking. In the same way you can extend blueprint functionality with your own C++ code, and thus use the two together.