Ok the problem with me is that I just know C++ for this kind of DOS programming. Do I need to learn C in order to develop(make would fit) a simple hello world operating system. The program which you wrote, Will I have to make an exe file from this and then boot from the floppy disk or it will work fine when I will boot with just c or cpp extention? Can you give an example in C++, and the procedures to run that program.

I would really appreciate!