Class  Description 

Calculator 
The Calculator class along with CalculatorController,
CalculatorModel and CalculatorView implements a
simpleminded calculator.

CalculatorController 
The CalculatorController class is the controller in this
MVC implementation of a calculator.

CalculatorModel 
This is the model of this MVC implementation of a calculator.

CalculatorView 
This is the view part of my MVC implementation of a calculator.
