Calculate Behavior

This project works out five features of a calculator:

1. Addition
2. Multiplication
3. Division
4. Subtraction
5. Power-on and power-off

Each feature would consist of scenarios. Capture each scenario as:

• initial condition (Given...)
• event (When...)
• effect (Then...)

Each feature is in a different markdown file. This template has one blank starting point.

As always, avoid passive voice :)