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Annotation of OpenXM_contrib/gmp/mpfr/isinteger.c, Revision 1.1.1.1

1.1       ohara       1: /* mpfr_isinteger -- test if a mpfr variable is integer
                      2:
                      3: Copyright 2001 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the MPFR Library.
                      6:
                      7: The MPFR Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The MPFR Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24: #include "mpfr.h"
                     25: #include "mpfr-impl.h"
                     26:
                     27: int
                     28: mpfr_isinteger (mpfr_srcptr x)
                     29: {
                     30:
                     31:   mpfr_t u;
                     32:   int expo;
                     33:   mp_prec_t prec;
                     34:   int result;
                     35:
                     36:   expo=(int)MPFR_EXP(x);
                     37:   prec=MPFR_PREC(x);
                     38:
                     39:   if (expo<=0)
                     40:     return 0;
                     41:
                     42:   if (expo>=prec)
                     43:     return 1;
                     44:
                     45:   mpfr_init2(u,prec);
                     46:   mpfr_trunc(u,x);
                     47:
                     48:   result = (mpfr_cmp (x,u) == 0);
                     49:
                     50:   mpfr_clear (u);
                     51:   return result;
                     52: }