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                           Standard_Header_Files                        _

   The correct use of header files is fundamental to the use of both  the
   C++  langauge  and ANSI C. Complete and accurate  prototyping  of  all
   functions  is compulsory in C++ and therefore the  appropriate  header
   file  must  be included whenever a standard library function  is  used
   within  a  source file. The header file which  contains  the  function
   prototype  for each library function can be found under the entry  for
   that function in the Function Reference.

   The common C practice of providing a function prototype locally,  only
   for functions actually used, should not be used in C++.