/* Test mpz_lucnum_ui and mpz_lucnum2_ui.

Copyright 2001 Free Software Foundation, Inc.

This file is part of the GNU MP Library test suite.

The GNU MP Library test suite is free software; you can redistribute it

and/or modify it under the terms of the GNU 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 test suite 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 General

Public License for more details.

You should have received a copy of the GNU General Public License along with

the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */

#include <stdio.h>

#include <stdlib.h>

#include "gmp.h"

#include "gmp-impl.h"

#include "tests.h"

/* Usage: t-lucnum_ui [n]

   Test up to L[n], or if n is omitted then the default limit below.  A

   literal "x" for the limit means continue forever, this being meant only

   for development.  */

void

check_sequence (int argc, char *argv[])

{

  unsigned long  n;

  unsigned long  limit = 100 * GMP_LIMB_BITS;

  mpz_t          want_ln, want_ln1, got_ln, got_ln1;

  if (argc > 1 && argv[1][0] == 'x')

    limit = ULONG_MAX;

  else if (argc > 1)

    limit = atoi (argv[1]);

  /* start at n==0 */

  mpz_init_set_si (want_ln1, -1); /* L[-1] */

  mpz_init_set_ui (want_ln,  2);  /* L[0]   */

  mpz_init (got_ln);

  mpz_init (got_ln1);

  for (n = 0; n < limit; n++)

    {

      mpz_lucnum2_ui (got_ln, got_ln1, n);

      MPZ_CHECK_FORMAT (got_ln);

      MPZ_CHECK_FORMAT (got_ln1);

      if (mpz_cmp (got_ln, want_ln) != 0 || mpz_cmp (got_ln1, want_ln1) != 0)

        {

          printf ("mpz_lucnum2_ui(%lu) wrong\n", n);

          mpz_trace ("want ln ", want_ln);

          mpz_trace ("got  ln ",  got_ln);

          mpz_trace ("want ln1", want_ln1);

          mpz_trace ("got  ln1",  got_ln1);

          abort ();

        }

      mpz_lucnum_ui (got_ln, n);

      MPZ_CHECK_FORMAT (got_ln);

      if (mpz_cmp (got_ln, want_ln) != 0)

        {

          printf ("mpz_lucnum_ui(%lu) wrong\n", n);

          mpz_trace ("want ln", want_ln);

          mpz_trace ("got  ln", got_ln);

          abort ();

        }

      mpz_add (want_ln1, want_ln1, want_ln);  /* L[n+1] = L[n] + L[n-1] */

      mpz_swap (want_ln1, want_ln);

    }

  mpz_clear (want_ln);

  mpz_clear (want_ln1);

  mpz_clear (got_ln);

  mpz_clear (got_ln1);

}

int

main (int argc, char *argv[])

{

  tests_start ();

  mp_trace_base = -16;

  check_sequence (argc, argv);

  tests_end ();

  exit (0);

}