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GNU Info (cpp-300.info)Include SyntaxInclude Syntax ============== Both user and system header files are included using the preprocessing directive `#include'. It has two variants: `#include <FILE>' This variant is used for system header files. It searches for a file named FILE in a standard list of system directories. You can prepend directories to this list with the `-I' option (Note: Invocation). `#include "FILE"' This variant is used for header files of your own program. It searches for a file named FILE first in the directory containing the current file, then in the same directories used for `<FILE>'. The argument of `#include', whether delimited with quote marks or angle brackets, behaves like a string constant in that comments are not recognized, and macro names are not expanded. Thus, `#include <x/*y>' specifies inclusion of a system header file named `x/*y'. However, if backslashes occur within FILE, they are considered ordinary text characters, not escape characters. None of the character escape sequences appropriate to string constants in C are processed. Thus, `#include "x\n\\y"' specifies a filename containing three backslashes. (Some systems interpret `\' as a pathname separator. All of these also interpret `/' the same way. It is most portable to use only `/'.) It is an error if there is anything (other than comments) on the line after the file name. automatically generated by info2www version 1.2.2.9 |