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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   comma
   ,
      <character> "," ASCII character 44.  Common names: ITU-T:
      comma.  Rare: ITU-T: cedilla; INTERCAL: tail.
      In the C programming language, "," is an operator which
      evaluates its first argument (which presumably has
      side-effects) and then returns the value of its second
      argument.  This is useful in "for" statements and macros.
      (1995-03-10)