How to Use Macro and Preprocessor in C M acro and Preprocessor in C Programming Sure, I can tell you some details about macro and preprocessor in C. A macro is a fragment of code that is given a name. You can define a macro in C using the **#define** preprocessor directive. For example, #define c 299792458 // speed of light` Here, when we use c in our program, it is replaced with 299792458 by the preprocessor¹. A preprocessor is a program that transforms your source code before it is compiled. It can perform tasks such as including header files, expanding macros, conditional compilation, etc. All preprocessor directives begin with a **#** symbol¹². For example, Free C Programming Language Tutorial for ...
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