# and ## Operators in C - GeeksforGeeks

www.geeksforgeeks.org/c/stringizing-and-token-pasting-operators-in-c/     2025-08-04T00:00:00.0000000
In C, # and ## operators are preprocessor operators using in macros for token manipulation. They are known as stringizing and token pasting operators and are used in macro definition with #define preprocessor.

c - # and ## in macros - Stack Overflow

stackoverflow.com/questions/4364971/and-in-macros
An occurrence of a parameter in a function-like macro, unless it is the operand of # or ##, is expanded before substituting it and rescanning the whole for further expansion. Because g 's parameter is the operand of #, the argument is not expanded but instead immediately stringified ("f (1,2)").

C Preprocessor and Macros - W3Schools

www.w3schools.com/c/c_macros.php
In C, the preprocessor runs before the actual compilation begins. It handles things like including files and defining macros.

Macros (The C Preprocessor)

gcc.gnu.org/onlinedocs/cpp/Macros.html
Macros (The C Preprocessor) 3 Macros ΒΆ A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. There are two kinds of macros. They differ mostly in what they look like when they are used. Object-like macros resemble data objects when used, function-like macros resemble function calls. You may define any valid ...

Macros and its types in C - GeeksforGeeks

www.geeksforgeeks.org/c/macros-and-its-types-in-c-cpp/     2026-07-31T00:00:00.0000000
Macros in C are preprocessor directives that replace code before the compilation process, helping simplify and optimize programs. They are commonly used to define constants and reusable code snippets. Macros improve code readability, reusability, and maintainability. They improve code readability and can enhance execution efficiency by avoiding function call overhead.

Macros in C - Online Tutorials Library

www.tutorialspoint.com/cprogramming/c_macros.htm
Macros in C are the names given to specific constant values or code statements which are replaced with their value/code before the compilation processor. C Macros are defined using the #define preprocessor directive.

Macros (GNU C Language Manual)

www.gnu.org/software/c-intro-and-ref/manual/html_node/Macros.html
Macros (GNU C Language Manual) 26.5 Macros A macro is a fragment of code that has been given a name. Whenever the name is used, it is replaced by the contents of the macro. There are two kinds of macros. They differ mostly in what they look like when they are used. Object-like macros resemble data objects when used, function-like macros resemble function calls. You may define any valid ...

C Preprocessor and Macros - Programiz

www.programiz.com/c-programming/c-preprocessor-macros
The C preprocessor is a macro preprocessor (allows you to define macros) that transforms your program before it is compiled. In this tutorial, you will be introduced to c preprocessors, and you will learn to use #include, #define and conditional compilation with the help of examples.

Macros (C/C++) | Microsoft Learn

learn.microsoft.com/en-us/cpp/preprocessor/macros-c-cpp?view=msvc-170
Learn more about: Macros (C/C++) 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 compilation. Conditional compilation directives allow you to suppress compilation of parts of a source file. They test a constant ...

The Complete Guide to C Macros, Preprocessor Directives, and Compiler ...

0xkiire.com/c_macros_guide/     2026-02-24T00:00:00.0000000
Mastering the C Preprocessor for Portable and Kernel-Level Code. A Comprehensive Resource for Cross-Platform Development and Linux Kernel Programming.
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