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Introduction [cont'd]
Input Output Functions [cont'd]
Structures and Unions [cont'd]
# Preprocessor [cont'd]
#ifdef in # Preprocessor of Programming in C
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#ifdef 
#ifdef is used to find constant is defined or not. If given constant defined already then returns 1 otherwise 0.
Syntax 
#ifdef (condition)
statement;
#endif
Program
	#include
	void main(){
	   #ifdef OS_LINUX
	   printf("Linux machine");
	   #else
	   printf("Need Linux machine to run this program");
	   #endif
	}
Output 
Need Linux machine to run this program
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