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──The Microsoft iostream Classes────────────────────────────────────────────
 
  int ipfx( int need = 0 );
 
  Parameter   Description
 
  <need>      Zero if called from formatted input functions; otherwise the
              minimum number of characters needed.
 
  Remarks
 
  This input prefix function is called by input functions prior to
  extracting data from the stream. Formatted input functions call ipfx( 0
  ), while unformatted input functions usually call ipfx( 1 ).
 
  Any ios object tied to this stream is flushed if <need> = 0 or if there
  are fewer than <need> characters in the input buffer. Also, ipfx
  extracts leading white space if ios::skipws is set.
 
  Return Value
 
  A nonzero return value if the operation was successful; 0 if the
  stream's error state is nonzero, in which case the function does
  nothing.
 
  See Also
 
  ◄istream::isfx►
 
 
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