| title | ms.custom | ms.date | ms.reviewer | ms.suite | ms.technology | ms.tgt_pltfrm | ms.topic | dev_langs | ms.assetid | caps.latest.revision | author | ms.author | manager | ||
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Directives to the Preprocessor | Microsoft Docs |
11/04/2016 |
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article |
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adc6251e-cf6b-4508-bdbb-55f446c838d3 |
7 |
mikeblome |
mblome |
ghogen |
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 |