C #else in C Language

Categories: C language

The #else preprocessor directive evaluates the expression or condition if condition of #if is false. It can be used with #if, #elif, #ifdef and #ifndef directives.


Syntax:

#if expression  

//if code  

#else  

//else code  

#endif  

Syntax with #elif:

#if expression  

//if code  

#elif expression  

//elif code  

#else  

//else code  

#endif  


C #else example

Let's see a simple example to use #else preprocessor directive.

#include <stdio.h>  

#include <conio.h>  

#define NUMBER 1  

void main() {  

#if NUMBER==0  

printf("Value of Number is: %d",NUMBER);  

#else  

print("Value of Number is non-zero");  

#endif         

getch();  

}  


Output:

Value of Number is non-zero

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