Return to tmul_2exp.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpfr / tests

Annotation of OpenXM_contrib/gmp/mpfr/tests/tmul_2exp.c, Revision 1.1

1.1     ! maekawa     1: /* Test file for mpfr_mul_2exp.
        !             2:
        !             3: Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
        !             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 Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 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 Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library 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 <stdio.h>
        !            23: #include <stdlib.h>
        !            24: #include <time.h>
        !            25: #include "gmp.h"
        !            26: #include "mpfr.h"
        !            27:
        !            28: /* checks that x*y gives the same results in double
        !            29:    and with mpfr with 53 bits of precision */
        !            30:
        !            31: int
        !            32: main(argc,argv) int argc; char *argv[];
        !            33: {
        !            34:   double x, z; mpfr_t w;
        !            35:
        !            36:   mpfr_init2(w, 53);
        !            37:
        !            38:   srand48(time(NULL));
        !            39:   x = drand48();
        !            40:   mpfr_set_d(w, x, 0);
        !            41:   mpfr_mul_2exp(w, w, 10, GMP_RNDZ);
        !            42:   if (x != (z = mpfr_get_d(w)/1024))
        !            43:     {
        !            44:       fprintf(stderr, "%f != %f\n", x, z);
        !            45:       exit (1);
        !            46:     }
        !            47:   exit (0);
        !            48: }
        !            49: