The C preprocessor is a macro preprocessor (allows you to define macros) that transforms your program before it is compiled. These transformations can be the inclusion of header files, macro expansions, etc. All
Macros (C/C++)Article 03/08/2021 6 contributors Feedback The preprocessor expands macros in all lines except preprocessor directives, lines that have a # as the first non-white-space character. It expands macros in parts of some directives that aren't skipped as part of a conditional ...
C++ offers new capabilities, some of which supplant the ones offered by the ANSI C preprocessor. These new capabilities enhance the type safety and predictability of the language:In C++, objects declared as const can be used in constant expressions. It allows programs to declare constants that ...
Here, we are going to learn how to define macros –In this example, we are defining two Macros YES and NO by using #define preprocessor directive.
In this article Standard predefined identifier Standard predefined macros Microsoft-specific predefined macros See also The Microsoft C/C++ compiler (MSVC) predefines certain preprocessor macros depending on the language (C or C++), the compilation target, and the chosen compiler options. ...
Here, we will learn how to define Macros to SET and CLEAR bit of a given PIN in C programming language? By IncludeHelp Last updated : March 10, 2024 Given a PIN (value in HEX) and bit number, we have to SET and then CLEAR given bit of the PIN (val) by using Macros....
X-Macros in C What are X-Macros? C has one neat feature that can be (ab)used to work around many of its shortcomings: The C Preprocessor, which is basically a way to define instructions for copy-and-pasting bits of text together....
To override a macro definition coming from a compiler specification, use the optionPreprocessor definitions (-D). To undefine the macro, use this option. During the build process, file-specific undefines are merged with project level build configurations. Using this option with a CMAKE-based tool...
When a macro parameter is used with a leading ‘#’, the preprocessor replaces it with the literal text of the actual argument, converted to astring constant. "##" 代表和一个符号相连接,符号可以是变量,或另一个宏符号。 就相当于如下: ...
Fortifying Macros Expansion The Problem In C, using a macro allows to reduce code duplication. However, depending on the macro's body, the moment they are expanded by the C preprocessor, the obtained C code may not be syntactally correct...