gl/printf-frexp.h

   1 /* Split a double into fraction and mantissa, for hexadecimal printf.
   2    Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Write a finite, positive number x as
  18      x = mantissa * 2^exp
  19    where exp >= DBL_MIN_EXP - 1,
  20          mantissa < 2.0,
  21          if x is not a denormalized number then mantissa >= 1.0.
  22    Store exp in *EXPPTR and return mantissa.  */
  23 extern double printf_frexp (double x, int *expptr);