1. There are no commands in C.
2. Graphics can be used by system-dependent libraries so you have to specify the platform you are using (MS DOS, MS Windows, X Window, etc).
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That's easy. There aren't any. C++ is designed to be as generic as possible, thus it provides generic text-based output only. Graphics output is platform-specific and is therefore not provided by the C++ standard. You can, of course, use graphics in C++, but you need a library and API that is specific to your platform and hardware. Most IDEs will provide an appropriate library, but as soon as you use graphics in your programs, you will generally lose the benefit of compiling your code on other platforms, unless you write your code specifically to cater for other non-generic libraries that are suitable for compilation upon other platforms.
It's easy: there are no commands in C, but a few statements (such as: expression, if, else, switch, while, do-while, for, break, continue, return and goto), and countless library functions (like printf, malloc and fopen).
In what context?
C language doesn't say anything about graphics, it is platform-dependent.
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