#include
#include <header name>
The include directive instructs the
preprocessor
to paste the text of the given file into the current file. Generally, it is
necessary to tell the preprocessor where to look for header files if they are
not placed in the current directory or a standard system directory. This can
be done either at compile time or as part of your compiler's project file.
This feature is implementation-specific, so see the
compilers page for more
information.
If an included file cannot be found, compilation will cease with an error.
Related
C
preprocessor tutorial
Starting out
