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Preprocessors


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C Preprocessor (CPP)
a text substitution tool and it instructs the compiler to do required pre-processing before the actual compilation
#define
Substitutes a preprocessor macro.
#include
Inserts a particular header from another file.
#undef
Undefines a preprocessor macro.
#ifdef
Returns true if this macro is defined.
#ifndef
Returns true if this macro is not defined.
#if
Tests if a compile time condition is true.
#else
the alternative for #if.
#elif
#else and #if in one statement.
#endif
Ends preprocessor conditional.
#error
Prints error message on stderr.
#pragma
Issues special commands to the compiler, using a standardized method.
#include <stdio.h>
Preprocessors Examples
#include "myheader.h"
Preprocessors Examples