Open sourced Windows 10 Calculator ported to Web, Android, iOS

Windows 10 calculator web

Microsoft recently open-sourced Windows 10’s built-in
Calculator app and published the source code, build system on
Github. Microsoft also stated that it wants to work with the
community and develop new features for the Calculator app.

As the Calculator app has been open-sourced, independent
developers can prototype new features that could become part of
Windows 10 at some point.

Windows 10 Calculator app has now been ported to Web, Android
and iOS by the developers of Uno Platform, an open source
cross-platform that allows UWP based code to run on non-Windows

In a blog post, Uno says
that Windows Calculator is built entirely using standard
C++ 11 and C++/CX. It uses a calculation engine from 1995.

To run Calculator on non-Windows 10 platforms, some parts of
the code were needed to be translated to C# and other parts
were adjusted to be compliant with clang’s C++ 11 support.

It is apparently not easy to port a full-featured Windows 10
Calculator app to Android and iOS. The developers met with the
following challenges:

  • Adjusing the C++ of the Calculation Engine
  • Native Code Interop Specifics
  • Converting the C++/CX code to C#
  • Converting the XAML
  • Localization Resources
  • Mono for WebAssembly Dynamic and Static Linking Support
  • The C adaptation layer
  • The case of C++ to C# callbacks

The very early versions of ported Calculator app is available
on Android, iOS and you can also try it in your
web browser from here.

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