To add to Mohan Ramachandra's reply, this was a proprietary library for the DOS environment. In other words, this was a graphics library for use in DOS programs only, not Windows or anything else. It was also designed and provided by one company - it is not standard, is not a part of C, and not a part of C++. While you certainly can do graphics for Windows, it is done differently. See here[^] for graphics stuff that is used with windows at the api level, though there is more in knowing when and how to use this stuff. Do note that normally in a windows program, one only draws to a window device context in response to a WM_PAINT message. (If you are using MFC, that would be in OnPaint or OnDraw. ) Graphics and display is different in Windows than it was in DOS. You have a lot of research and reading to do. Good luck.
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