How can I get and use the header file graphics.h in my C++ program?
<graphics.h> is very old library. It's better to use something that is new
Here are some 2D libraries (platform independent) for C/C++
SDL
GTK+
Qt
Also there is a free very powerful 3D open source graphics library for C++
OGRE
Compiler can't find sstream?
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.
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