C #error

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This directive indicates the error. If the #error directive is found any error then compiler gives the fatal error and skip for further process of compilation.

Syntax:

#error error_statement

Syntax:

#include <stdio.h>
#ifndef _STRING_H  
#error Include string header file then compile  
#else  
void main(){  
    char s[]="Hello";  
    printf("%s",s);  
}  
#endif
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