/* mpfr_neg -- change the sign of a floating-point number

Copyright (C) 1999 PolKA project, Inria Lorraine and Loria

This file is part of the MPFR Library.

The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
License for more details.

You should have received a copy of the GNU Library General Public License
along with the MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"

void 
#if __STDC__
mpfr_neg(mpfr_ptr a, mpfr_srcptr b, unsigned char rnd_mode)
#else
mpfr_neg(a, b, rnd_mode)
     mpfr_ptr a; 
     mpfr_srcptr b; 
     unsigned char rnd_mode; 
#endif
{
  if (a != b) mpfr_set4(a, b, rnd_mode, -SIGN(b));
  else CHANGE_SIGN(a);
  return; 
}