Which language is used for writing Operating systems?

Question

I have been deciding to make a simple os but i don't know how to start.So anybody can tell me from beginning and prerequisites for it. Then i shall be grateful.

Answer 1

C/C++

Answer 2

Just learn Linux framework and develop from there. Take a look at the GUI of a PS4 machine developed from linux, that's an OS on it's own of Linux design.

Answer 3

there is a good OS called freebsd as this link https://www.freebsd.org/ fully in open source and you can study from all technics.