C #else

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If #if the condition is false then #else evaluates the expression or condition. It should be used with #if, #elif, #ifdef and #ifndef directives.

Syntax:

#if expression
//if code
#else
//else code
#endif

Example:

#include <stdio.h> 
#define N 1  
void main() {  
    #if (N==0)  
        printf("The Number value is Zero");  
    #else  
        printf("The Number value is Non-Zero");  
    #endif    
}
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