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   The C preprocessor implements the macro language used to transform C,
C++, and Objective-C programs before they are compiled.  It can also be
useful on its own.
Overview
Header Files
Macros
Conditionals
Diagnostics
Line Control
Pragmas
Other Directives
Preprocessor Output
Traditional Mode
Implementation Details
Invocation
GNU Free Documentation License
Index of Directives
Concept Index
 --- The Detailed Node Listing ---

Overview
Initial processing
Tokenization
The preprocessing language
Header Files
Include Syntax
Include Operation
Search Path
Once-Only Headers
Computed Includes
Wrapper Headers
System Headers
Macros
Object-like Macros
Function-like Macros
Macro Arguments
Stringification
Concatenation
Variadic Macros
Predefined Macros
Undefining and Redefining Macros
Macro Pitfalls
Predefined Macros
Standard Predefined Macros
Common Predefined Macros
System-specific Predefined Macros
C++ Named Operators
Macro Pitfalls
Misnesting
Operator Precedence Problems
Swallowing the Semicolon
Duplication of Side Effects
Self-Referential Macros
Argument Prescan
Newlines in Arguments
Conditionals
Conditional Uses
Conditional Syntax
Deleted Code
Conditional Syntax
Ifdef
If
Defined
Else
Elif
Implementation Details
Implementation-defined behavior
Implementation limits
Obsolete Features
Differences from previous versions
Obsolete Features
Assertions
Obsolete once-only headers
Miscellaneous obsolete features
   Copyright (C) 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001 Free Software Foundation, Inc.

   Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
any later version published by the Free Software Foundation.  A copy of
the license is included in the section entitled "GNU Free Documentation
License".

   This manual contains no Invariant Sections.  The Front-Cover Texts
are (a) (see below), and the Back-Cover Texts are (b) (see below).

   (a) The FSF's Front-Cover Text is:

   A GNU Manual

   (b) The FSF's Back-Cover Text is:

   You have freedom to copy and modify this GNU Manual, like GNU
software.  Copies published by the Free Software Foundation raise funds
for GNU development.
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