Error due to #include

Question

I am trying to compile a program which includes the graphics.h header file for C. I have added the graphics.h and winbgim.h header fil

Answer 1

graphics.h is a non-standard header. Most likely it refers to the old BGI graphics library of the Turbo C DOS compiler. It will only work on that particular compiler. And of course DOS is a completely obsolete OS nowadays.

If you are interested in 3D graphics programming, then OpenGL and/or DirectX are indeed better, modern alternatives, supported by many compilers.