How Can I Declare Variables to Persona from A C++ Character Class?

Hi Guys, I was developing on Unity 5 Game engine, and now I’ve converted to Unreal 4 Engine. I will be up to the point without any introductions:

in Unity 5 I could use declared variables (like: floats, booleans… etc.) from a Java Script, so that later I could manipulate them to blend between state machines or Animations. but I see no way I can do that in Unreal Engine 4 since there’s no detailed documentation about persona and C++ scripting together.
My Issue is that I prefer on C++ Scripting Method to develop my create Character’s Game Logic (not on Blueprints), but in the same time I want to get use of Persona and State Machines, just as Unity 5.

so. how can I declare a float value in a C++ Script Class [Character Class] to persona?