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     The fprintf function formats and prints a series of characters and
     values to the output stream. Each <argument> (if any) is converted
     and output according to the corresponding format specification in
     <format>.
 
     The <format> argument is of the same form and function as the
     <format> argument for the printf function. See printf for
     descriptions of <format> and <argument>.
 
     Return Value
 
     The fprintf function returns the number of characters printed, or
     a negative value in the case of an output error.
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