t-conv.c
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上传日期:2022-08-06
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- /* Test mpf_get_str and mpf_set_str.
- Copyright 1996, 2000, 2001, 2008 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h> /* for strlen */
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- #ifndef SIZE
- #define SIZE 10
- #endif
- #ifndef EXPO
- #define EXPO 200
- #endif
- int
- main (int argc, char **argv)
- {
- mpf_t x, y;
- int reps = 20000;
- int i;
- mp_size_t bprec = 100;
- mpf_t d, rerr, max_rerr, limit_rerr;
- char *str;
- mp_exp_t bexp;
- long size, exp;
- int base;
- char buf[SIZE * GMP_LIMB_BITS + 5];
- tests_start ();
- if (argc > 1)
- {
- reps = strtol (argv[1], 0, 0);
- if (argc > 2)
- bprec = strtol (argv[2], 0, 0);
- }
- mpf_set_default_prec (bprec);
- mpf_init_set_ui (limit_rerr, 1);
- mpf_div_2exp (limit_rerr, limit_rerr, bprec);
- #if VERBOSE
- mpf_dump (limit_rerr);
- #endif
- mpf_init (rerr);
- mpf_init_set_ui (max_rerr, 0);
- mpf_init (x);
- mpf_init (y);
- mpf_init (d);
- /* First test some specific values. */
- mpf_set_str (y, "1.23456e1000", 0);
- mpf_set_str (x, "1.23456e1000", 10);
- if (mpf_cmp (x, y) != 0)
- abort ();
- mpf_set_str (x, "1.23456e+1000", 0);
- if (mpf_cmp (x, y) != 0)
- abort ();
- mpf_set_str (x, "1.23456e+1000", 10);
- if (mpf_cmp (x, y) != 0)
- abort ();
- /* Now test random values. */
- for (i = 0; i < reps; i++)
- {
- if (i == 0)
- {
- /* exercise the special case in get_str for for x==0 */
- mpf_set_ui (x, 0L);
- base = 10;
- }
- else
- {
- size = urandom () % (2 * SIZE) - SIZE;
- exp = urandom () % EXPO;
- mpf_random2 (x, size, exp);
- base = urandom () % 61 + 2;
- }
- str = mpf_get_str (0, &bexp, base, 0, x);
- if (str[0] == '-')
- sprintf (buf, "-0.%s@%ld", str + 1, bexp);
- else
- sprintf (buf, "0.%s@%ld", str, bexp);
- mpf_set_str_or_abort (y, buf, -base);
- (*__gmp_free_func) (str, strlen (str) + 1);
- mpf_reldiff (rerr, x, y);
- if (mpf_cmp (rerr, max_rerr) > 0)
- {
- mpf_set (max_rerr, rerr);
- #if VERBOSE
- mpf_dump (max_rerr);
- #endif
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR after %d testsn", i);
- printf ("base = %dn", base);
- printf (" x = "); mpf_dump (x);
- printf (" y = "); mpf_dump (y);
- abort ();
- }
- }
- }
- mpf_clear (limit_rerr);
- mpf_clear (rerr);
- mpf_clear (max_rerr);
- mpf_clear (x);
- mpf_clear (y);
- mpf_clear (d);
- tests_end ();
- exit (0);
- }