/* Test mpz_add, mpz_add_ui, mpz_cmp, mpz_cmp, mpz_mul, mpz_sqrtrem.

Copyright (C) 1991, 1993, 1994, 1996, 2000 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"

void debug_mp ();

#ifndef SIZE
#define SIZE 100
#endif

main (argc, argv)
     int argc;
     char **argv;
{
  mpz_t x2;
  mpz_t x;
  mpz_t temp, temp2;
  mp_size_t x2_size;
  int i;
  int reps = 10000;
  unsigned long nth;

  if (argc == 2)
     reps = atoi (argv[1]);

  mpz_init (x2);
  mpz_init (x);
  mpz_init (temp);
  mpz_init (temp2);

  for (i = 0; i < reps; i++)
    {
      mp_size_t mask;

      mask = 1L << (urandom() % BITS_PER_MP_LIMB);
      x2_size = urandom () % SIZE + 1;
      mpz_random2 (x2, x2_size);
      nth = urandom () % mask + 1;
      if ((urandom() & 1) == 0)
	{
	  mpz_root (x, x2, nth);
	  mpz_pow_ui (x2, x, nth);
	  if (mpz_sgn (x2) != 0)
	    mpz_sub_ui (x2, x2, 1);
	}

      mpz_root (x, x2, nth);
      mpz_pow_ui (temp, x, nth);

      /* Is power of result > argument?  */
      if (mpz_cmp (temp, x2) > 0)
	{
	  fprintf (stderr, "ERROR after test %d\n", i);
	  debug_mp (x2, 10);
	  debug_mp (x, 10);
	  fprintf (stderr, "nth: %lu\n", nth);
	  abort ();
	}

      if (nth > 10000)
	continue;		/* skip too expensive test */

      mpz_add_ui (temp2, x, 1);
      mpz_pow_ui (temp2, temp2, nth);

      /* Is square of (result + 1) <= argument?  */
      if (mpz_cmp (temp2, x2) <= 0)
	{
	  fprintf (stderr, "ERROR after test %d\n", i);
	  debug_mp (x2, 10);
	  debug_mp (x, 10);
	  fprintf (stderr, "nth: %lu\n", nth);
	  abort ();
	}
    }

  exit (0);
}

void
debug_mp (x, base)
     mpz_t x;
{
  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
}
