More scientific cal.

If you have a knowledge about how scientific calculators are working to solve hard problems like integration and differentiation, then you are the right one here.
Just implement the idea and create separate button for them in this calculator.
Hence enhance the features of the calculator.

Start by locating the Java AWT calculator entry point and reviewing how its existing Fibonacci and factorial features are implemented. Research the required integration and differentiation behavior before choosing the scope and interface for separate scientific-calculator controls. Done means the calculator supports the agreed scientific operations through the new controls.

索引モデルが issue の本文から書いたものです。