What tools are needed for a program for Android or Windows?

Question

C++ / C#

1. What tools, programs you need to know in order to write a working program for windows, or for Android.
Provided that we write only on C ++.
In the arsenal, only knowledge of C ++.
2. And for example, if the game is simple to write in 2D, what you need to know.

Answer 1

Qt allows you to write software for both Windows and Android.