Answer / raghav_jk

Preprocessor Directive are
#include
#if
#else
#define
#ifdef
#ifndef
#endif

the command starts with # are called preprocessor directives

Uses
File Inclussion
Conditional Compilation
Macro Expansion

Answer / vl

The pre processor directives are the code line which are
replaced by the actuall value (header file and Macro
replacements) before compiler start the syntax checks.

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