DIRECTIVE MEANING
# Null Directive,no action
#include Include a source code file
#define Define a macro
#undef Remove the definition of a macro
#if Compile code if condition is true
#ifdef Compile code if macro is defined
#ifndef Compile code if macro is not defined
#else Compile code if previous #if......condition is not true
#elif Compile code if previous #if......condition is not true and current condition is true
#endif Termonate #if....#else conditional block
#error Stop compiling and display error message
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