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The C preprocessor (CPP) is a text file processor that is used with C, C++ and other programming tools. The preprocessor provides for file inclusion (often header files), macro expansion, conditional compilation, and line control. Although named in association with C and used with C, the preprocessor capabilities are not inherently tied to the ...
Note that the preprocessor is in principle language agnostic, and is a lexical preprocessor, working at the lexical analysis level – it does not do parsing, and thus is unable to do any processing specific to C syntax. The input to the compiler is the translation unit, and thus it does not see any preprocessor directives, which have all been ...
The most common example of this is the C preprocessor, which takes lines beginning with '#' as directives. The C preprocessor does not expect its input to use the syntax of the C language. Some languages take a different approach and use built-in language features to achieve similar things. For example:
The basic character set of the C programming language is a subset of the ASCII character set that includes nine characters which lie outside the ISO 646 invariant character set. This can pose a problem for writing source code when the encoding (and possibly keyboard ) being used does not support any of these nine characters.
C. C alternative tokens; C preprocessor; The C Programming Language; C standard library; C syntax; C Traps and Pitfalls; C data types; C, The Complete Reference; C11 (C standard revision) C17 (C standard revision) C23 (C standard revision) C99; CERT Coding Standards; CFLAGS; Comma operator; Comp.lang.c; Compatibility of C and C++
In C and C++, the language supports a simple macro preprocessor. Source lines that should be handled by the preprocessor, such as #define and #include are referred to as preprocessor directives . Syntactic constructs similar to C's preprocessor directives, such as C# 's #if , are also typically called "directives", although in these cases there ...
This is essential in order to guide pass two which is the line-by-line translation into machine language. [9] Commonly used assemblers include: x86 assembly languages (used in Intel and AMD processors) [10] ARM assembly language (used in mobile devices) [10] MIPS assembly language (used in gaming consoles) [10] PowerPC assembly language [10]
In computing, blue paint refers to the mark given to preprocessing tokens by the C preprocessor that temporarily disables expansion of those tokens. A token is said to be painted blue when it has been disabled in this way.