Double quotes may also be used to include local or project-specific header files.
Later revisions of the C standard have added several new required header files to the library.
A widely available header file included in the X11 system, xtrapbits.
For example, a subdirectory of the source tree plus an associated global header file is a very common case.
The interface of a class is usually defined in a header file.
Separate data and header files are used for each type of data.
This allows the compression of the data while leaving the header file accessible.
Each universe had its own command set, libraries and header files.
The library is simply a collection of header files, and so, does not need to be independently compiled.
In its simplest form, only a single header file is required.
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