title: Java MVC Calculator
body: <p>I have to make a scientific calculator which is based on MVC model but I don't really know how to divide properly my controlers. I thought to make 1 controler for simple operators (+ - / *) 1 for digits (and dot) 1 other for complex operators (cos sin x²) and 1 for =. I don't really know if I'm going to use the proper way.
  Can you give me some advices to succeed this projet ?</p>