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Annotation of OpenXM_contrib/gmp/tests/mpz/t-get_d.c, Revision 1.1.1.1

1.1       ohara       1: /* Test mpz_get_d.
                      2:
                      3: Copyright 2002 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP 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 GNU MP 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 GNU MP 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 "gmp.h"
                     25: #include "gmp-impl.h"
                     26: #include "tests.h"
                     27:
                     28:
                     29: void
                     30: check_onebit (void)
                     31: {
                     32:   int     i;
                     33:   mpz_t   z;
                     34:   double  got, want;
                     35:   /* FIXME: It'd be better to base this on the float format. */
                     36: #ifdef __vax
                     37:   int     limit = 127;  /* vax fp numbers have limited range */
                     38: #else
                     39:   int     limit = 512;
                     40: #endif
                     41:
                     42:   mpz_init (z);
                     43:
                     44:   mpz_set_ui (z, 1L);
                     45:   want = 1.0;
                     46:
                     47:   for (i = 0; i < limit; i++)
                     48:     {
                     49:       got = mpz_get_d (z);
                     50:
                     51:       if (got != want)
                     52:         {
                     53:           printf    ("mpz_get_d wrong on 2**%d\n", i);
                     54:           mpz_trace ("   z    ", z);
                     55:           printf    ("   want  %.20g\n", want);
                     56:           printf    ("   got   %.20g\n", got);
                     57:           abort();
                     58:         }
                     59:
                     60:       mpz_mul_2exp (z, z, 1L);
                     61:       want *= 2.0;
                     62:     }
                     63:   mpz_clear (z);
                     64: }
                     65:
                     66:
                     67: int
                     68: main (void)
                     69: {
                     70:   tests_start ();
                     71:
                     72:   check_onebit ();
                     73:
                     74:   tests_end ();
                     75:   exit (0);
                     76: }