The #include directive inserts the contents of a
specified file into the text stream delivered to the compiler.
Usually, standard headers and global definitions are included in
the program stream with the #include directive. This
directive has two forms:
#include "filename" newline
#include <filename> newline
The format of filename is platform-dependent. If the
filename is enclosed in quotation marks, the search for
the named file begins in the directory where the file containing
the
See your platform-specific DEC C
documentation for information on the search path rules used for
file inclusion. #include directive resides. If the file is not
found there, or if the file name is enclosed in angle brackets
(< >), the file search follows platform-defined search rules. In
general, the quoted form of #include is used to include
files written by users, while the bracketed form is used to include
standard library files.
Macro substitution is allowed within the #include
preprocessor directive.
For example, the following two directives can be used to include a file:
#define macro1 "file.ext" #include macro1
Defined macros used in #include directives
must evaluate to one of the two following acceptable
#include file specifications or an error is reported:
"filename"
<filename>
An included file may itself contain #include
directives. Although the DEC C compiler imposes no inherent limitation on the
nesting level of inclusion, the permitted depth depends on hardware
and operating system restrictions.