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Introduction [cont'd]
Input Output Functions [cont'd]
Structures and Unions [cont'd]
# Preprocessor [cont'd]
#if and #else in # Preprocessor of Programming in C
1920 Views
#if and #else 
If and Else also decision making statements of preprocessor directive.
Syntax 
#if (condition)
statement;
#else
statement;
#endif
Program
	#include
	void main(){
	   #if defined(OS_WINDOWS)
	   printf("OS_WINDOWS is defined");
	   #else
	   printf("OS_WINDOWS is not defined");
	   #endif
	}
Output 
OS_WINDOWS is not defined
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