Is it possible to make an os with c or c++?

Answer 1

Pretty much any OS's kernel is written in C mixed with some ASM, or just pure ASM. C++ isnt used for OS kernels because c++ relies on runtime libraries and has features that needs an OS to already be present, which doesnt make it a good choice for a kernel, however, the rest of the OS could certainly be written in c++.

Answer 2

Well, The majority of OS are in C and C++.