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/* mpfr_isinteger -- test if a mpfr variable is integer
Copyright (C) 2001 Free Software Foundation.
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 <math.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
/* The computation of y=pow(x,z) is done by
y=exp(z*log(x))=x^z
*/
int
#if __STDC__
mpfr_isinteger(mpfr_srcptr x)
#else
mpfr_isinteger(x)
mpfr_srcptr x;
#endif
{
mpfr_t u;
int expo;
mp_prec_t prec;
expo=(int)MPFR_EXP(x);
prec=MPFR_PREC(x);
if (expo<=0)
return 0;
if (expo>=prec)
return 1;
mpfr_init2(u,prec);
mpfr_trunc(u,x);
if(mpfr_cmp(x,u)==0) return 1;
else return 0;
}
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