| description | title | ms.date | ms.assetid |
|---|---|---|---|
Learn more about: Directives to the Preprocessor |
Directives to the Preprocessor |
11/04/2016 |
adc6251e-cf6b-4508-bdbb-55f446c838d3 |
A "directive" instructs the C preprocessor to perform a specific action on the text of the program before compilation. Preprocessor directives are fully described in the Preprocessor Reference. This example uses the preprocessor directive #define:
#define MAX 100
This statement tells the compiler to replace each occurrence of MAX by 100 before compilation. The C compiler preprocessor directives are:
| #define | #endif | #ifdef | #line |
|---|---|---|---|
#elif |
#error |
#ifndef | #pragma |
#else |
#if |
#include |
#undef |