/* Test mpq_add and mpq_sub.

Copyright 2001 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 2.1 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; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"


void
check_all (mpq_ptr x, mpq_ptr y, mpq_ptr want_add, mpq_ptr want_sub)
{
  mpq_t  got;
  int    neg_x, neg_y, swap;

  mpq_init (got);

  MPQ_CHECK_FORMAT (want_add);
  MPQ_CHECK_FORMAT (want_sub);
  MPQ_CHECK_FORMAT (x);
  MPQ_CHECK_FORMAT (y);

  for (swap = 0; swap <= 1; swap++)
    {
      for (neg_x = 0; neg_x <= 1; neg_x++)
        {
          for (neg_y = 0; neg_y <= 1; neg_y++)
            {
              mpq_add (got, x, y);
              MPQ_CHECK_FORMAT (got);
              if (! mpq_equal (got, want_add))
                {
                  printf ("mpq_add wrong\n");
                  mpq_trace ("  x   ", x);
                  mpq_trace ("  y   ", y);
                  mpq_trace ("  got ", got);
                  mpq_trace ("  want", want_add);
                  abort ();
                }

              mpq_sub (got, x, y);
              MPQ_CHECK_FORMAT (got);
              if (! mpq_equal (got, want_sub))
                {
                  printf ("mpq_sub wrong\n");
                  mpq_trace ("  x   ", x);
                  mpq_trace ("  y   ", y);
                  mpq_trace ("  got ", got);
                  mpq_trace ("  want", want_sub);
                  abort ();
                }


              mpq_neg (y, y);
              mpq_swap (want_add, want_sub);
            }

          mpq_neg (x, x);
          mpq_swap (want_add, want_sub);
          mpq_neg (want_add, want_add);
          mpq_neg (want_sub, want_sub);
        }

      mpq_swap (x, y);
      mpq_neg (want_sub, want_sub);
    }

  mpq_clear (got);
}


void
check_data (void)
{
  static const struct {
    const char  *x;
    const char  *y;
    const char  *want_add;
    const char  *want_sub;

  } data[] = {

    { "0", "0", "0", "0" },
    { "1", "0", "1", "1" },
    { "1", "1", "2", "0" },

    { "1/2", "1/2", "1", "0" },
    { "5/6", "14/15", "53/30", "-1/10" },
  };

  mpq_t  x, y, want_add, want_sub;
  int i;

  mpq_init (x);
  mpq_init (y);
  mpq_init (want_add);
  mpq_init (want_sub);

  for (i = 0; i < numberof (data); i++)
    {
      mpq_set_str_or_abort (x, data[i].x, 0);
      mpq_set_str_or_abort (y, data[i].y, 0);
      mpq_set_str_or_abort (want_add, data[i].want_add, 0);
      mpq_set_str_or_abort (want_sub, data[i].want_sub, 0);

      check_all (x, y, want_add, want_sub);
    }

  mpq_clear (x);
  mpq_clear (y);
  mpq_clear (want_add);
  mpq_clear (want_sub);
}


void
check_rand (void)
{
  mpq_t  x, y, want_add, want_sub;
  int i;
  gmp_randstate_ptr  rands = RANDS;

  mpq_init (x);
  mpq_init (y);
  mpq_init (want_add);
  mpq_init (want_sub);

  for (i = 0; i < 500; i++)
    {
      mpz_errandomb (mpq_numref(x), rands, 512L);
      mpz_errandomb_nonzero (mpq_denref(x), rands, 512L);
      mpq_canonicalize (x);

      mpz_errandomb (mpq_numref(y), rands, 512L);
      mpz_errandomb_nonzero (mpq_denref(y), rands, 512L);
      mpq_canonicalize (y);

      refmpq_add (want_add, x, y);
      refmpq_sub (want_sub, x, y);

      check_all (x, y, want_add, want_sub);
    }

  mpq_clear (x);
  mpq_clear (y);
  mpq_clear (want_add);
  mpq_clear (want_sub);
}


int
main (void)
{
  tests_start ();

  check_data ();
  check_rand ();

  tests_end ();

  exit (0);
}
