89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/* Test mpq_get_d
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "urandom.h"
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#ifndef SIZE
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#define SIZE 8
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#endif
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main (argc, argv)
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int argc;
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char **argv;
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{
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mpq_t a;
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mp_size_t size;
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int reps = 10000;
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int i, j;
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double last_d, new_d;
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mpz_t eps;
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if (argc == 2)
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reps = atoi (argv[1]);
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/* The idea here is to test the monotonousness of mpq_get_d by adding
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numbers to the numerator and denominator. */
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mpq_init (a);
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mpz_init (eps);
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for (i = 0; i < reps; i++)
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{
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size = urandom () % SIZE - SIZE/2;
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mpz_random2 (mpq_numref (a), size);
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do
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{
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size = urandom () % SIZE - SIZE/2;
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mpz_random2 (mpq_denref (a), size);
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}
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while (mpz_cmp_ui (mpq_denref (a), 0) == 0);
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mpq_canonicalize (a);
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last_d = mpq_get_d (a);
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for (j = 0; j < 10; j++)
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{
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size = urandom () % SIZE;
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mpz_random2 (eps, size);
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mpz_add (mpq_numref (a), mpq_numref (a), eps);
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mpq_canonicalize (a);
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new_d = mpq_get_d (a);
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if (last_d > new_d)
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abort ();
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last_d = new_d;
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}
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}
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exit (0);
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}
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dump (x)
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mpq_t x;
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{
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mpz_out_str (stdout, 10, mpq_numref (x));
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printf ("/");
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mpz_out_str (stdout, 10, mpq_denref (x));
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printf ("\n");
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}
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