Clarification on numbering for header files?

Hi, I have 2 examples here that demonstrate numbering in header files, Ex1 and Ex2. My question, which is the correct way to save the code for a header file, depending on if your using a GCC compiler, versus another compiler? Either compiler or any compiler?

Ex1
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61.  extern istream cin;		/// Linked to standard input
62.  extern ostream cout;		/// Linked to standard output
63.  extern ostream cerr;		/// Linked to standard error (unbuffered)
64.  extern ostream clog;		/// Linked to standard error (buffered)
65.


Ex2
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extern istream cin;		/// Linked to standard input
extern ostream cout;		/// Linked to standard output
extern ostream cerr;		/// Linked to standard error (unbuffered)
extern ostream clog;		/// Linked to standard error (buffered) 


I'm sure it's a dumb question, I'm a NOOB afterall. I just want to be sure that I'm not including numbering in my headers that will mess up the compiler when it reads the files. THANKS!
Do not include the line numbers. Ex2 is the correct one.
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