preprocessor in c

INTRODUCTION TO C PREPROCESSOR

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Preprocessor in C S-Teacher

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INTRODUCTION TO C PREPROCESSOR

C Preprocessor

OverviewPreprocessor DirectivesConditional Compilation

Overview

Six phases to execute C:1. Edit2. Preprocess3. Compile4. Link5. Load6. Execute

C Preprocessor

All preprocessor directives begin with #Possible actions

Inclusion of other filesDefinition of symbolic constants & macrosConditional compilation of program codeConditional compilation of preprocessor

directives

Preprocessor Directives

#define for symbolic constants#define identifier text

Creates symbolic constants The “identifier” is replaced by “text” in the

programExample

#define PI 3.14

area = PI * radius * radius; Replaced by “area = 3.14 * radius * radius” by

preprocessor before compilation

Conditional Compilation Controls the execution of preprocessor

directives & compilation of codeDefine NULL, if it hasn’t been defined yet#if !defined(NULL)#define NULL 0

#endifUse to comment out code (for comments)#if 0code prevented from compiling

#endif

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