Portable calculator built using app.nit

Project structure

calculator_logic defines CalculatorContext with all the business logic of a calculator. It takes as input operations and numbers, and outputs the text to display.
calculator implements the portable graphical interface using the app.nit framework
scientific_calculator refines calculator to add scientific operations.
android_calculator refines calculator to get a nicer aesthetic on Android.
ios_calculator refines calculator to get a nicer aesthetic on iOS.
calculator_test test CalculatorContext as a black box.

Compilation

Compile and run on the desktop (GNU/Linux and OS X) with:
```
 make
 bin/calculator
```
Compile for Android and install on a device or emulator with:
```
 make bin/android.apk
 adb install -r bin/calculator.apk
```

Compile for iOS and run on the simulator with:

 make bin/android.app
 ios-sim launch bin/calculator.app