#ifdef in c for filename for guarding static function in header file -

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I have a condition in which I have a header file and it must be included in more than one file in it some fixed functions The prototype is something I want to do 

  #ifdef filename.c static foo (zero); Static bar; #endif   
 This means that if I include it in the filename by the file name, these function prototypes are active and if they are included in another file they are cool   
 
 
  filename.c  is a relative unusual symbol. In addition, you must explicitly define a mark in your filename-file. Like:  
  #ifdef FILENAME_C_ static foo (zero); Static bar; #endif   
 and your  filename.c  -file  
  #define FILENAME_C_   
 You should like the underscore  _  -version in  FILENAME_C _ , it is more general and easy to read, however, I do not understand that you can only do those tasks Why would you declare it? You have to define them in filename.c-file anyway. What do you want to achieve with this?

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