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/* Test mpq_get_d
Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "urandom.h"
#ifndef SIZE
#define SIZE 8
#endif
main (argc, argv)
int argc;
char **argv;
{
mpq_t a;
mp_size_t size;
int reps = 10000;
int i, j;
double last_d, new_d;
mpz_t eps;
if (argc == 2)
reps = atoi (argv[1]);
/* The idea here is to test the monotonousness of mpq_get_d by adding
numbers to the numerator and denominator. */
mpq_init (a);
mpz_init (eps);
for (i = 0; i < reps; i++)
{
size = urandom () % SIZE - SIZE/2;
mpz_random2 (mpq_numref (a), size);
do
{
size = urandom () % SIZE - SIZE/2;
mpz_random2 (mpq_denref (a), size);
}
while (mpz_cmp_ui (mpq_denref (a), 0) == 0);
mpq_canonicalize (a);
last_d = mpq_get_d (a);
for (j = 0; j < 10; j++)
{
size = urandom () % SIZE;
mpz_random2 (eps, size);
mpz_add (mpq_numref (a), mpq_numref (a), eps);
mpq_canonicalize (a);
new_d = mpq_get_d (a);
if (last_d > new_d)
abort ();
last_d = new_d;
}
}
exit (0);
}
dump (x)
mpq_t x;
{
mpz_out_str (stdout, 10, mpq_numref (x));
printf ("/");
mpz_out_str (stdout, 10, mpq_denref (x));
printf ("\n");
}
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