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Annotation of OpenXM_contrib/gmp/mpfr/tests/tmul_2exp.c, Revision 1.1.1.1

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: