C #ifdef

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It is a preprocessor directive checks macro is defined by #define. If yes, it executes the code.

Syntax:

#ifdef MACRO
//source code
#endif

Example:

#include <stdio.h>    
#define NOVALUE  
void main() {  
    int i=0;  
    #ifdef NOVALUE  
        i=2;  
    #else  
        printf("Enter the Value of i is:");  
        scanf("%d", &i);  
    #endif         
    printf("The Value of i: %d\n", i);  
}
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