[Solved] How to define new header files with preprocessing directive #define? [duplicate]

by


You must fix your usage of the preprocessor as follows:

  • Include a space between #define and its operand.
  • To implement include guards properly, you need a corresponding #ifndef before the #define.
  • As wildplasser said, you can’t use macro names beginning with underscore(s), so remove them, or replace them with some other prefix of your own.
#ifndef HELLO_H
#define HELLO_H 

void    hello(); 

#endif // HELLO_H

solved How to define new header files with preprocessing directive #define? [duplicate]