C/C++ Pre-processor Commands

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#, ##	manipulate strings
#define	define variables
#error	display an error message
#if, #ifdef, #ifndef, #else, #elif, #endif	conditional operators
#include	insert the contents of another file
#line	set line and file information
#pragma	implementation specific command
#undef	used to undefine variables
Predefined preprocessor variables	miscellaneous preprocessor variables