Tell me about 16bit operating system and where will i found it?

Question

What is 16bit operating system?

Answer 1

I don't think I know one. In any case, maybe this will help you:

https://en.wikipedia.org/wiki/16-bit
http://www.karbosguide.com/hardware/module6c3.htm

Answer 2

I want the header file of graphic in c++.

Answer 3

Because he programs in Turbo C++. ( ͡° ͜ʖ ͡°)