c preprocessor - C++ #ifndef for include files, why is all caps used for the header file? -

July 15, 2013

I wonder why the name after the #ifndef instruction is always all caps and not so To match the name of the real headers file? What are the rules around it? I was looking around the net, but I have not got any explanation for this. If my header file has the Maierheader It is OK to use it:

  #ifndef MYHEADER

If so, why? What are the rules? These are preprocessor symbols and there are no such rules (unless they have #defines

  
) 
  However, conference pre-processor symbols have to use all-caps.


















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