mpfr-2.4.1/tests/tsinh_cosh.c

/* Test file for mpfr_sinh_cosh.

Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */

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

#include "mpfr-test.h"

#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0)

static void
failed (mpfr_t x, mpfr_t esh, mpfr_t gsh, mpfr_t ech, mpfr_t gch)
{
  printf ("error : mpfr_sinh_cosh (x) x = ");
  mpfr_out_str (stdout, 10, 0, x, GMP_RNDD);
  printf ("\nsinh(x) expected ");
  mpfr_out_str (stdout, 10, 0, esh, GMP_RNDD);
  printf ("\n        got ");
  mpfr_out_str (stdout, 10, 0, gsh, GMP_RNDD);
  printf ("\ncosh(x) expected ");
  mpfr_out_str (stdout, 10, 0, ech, GMP_RNDD);
  printf ("\n        got ");
  mpfr_out_str (stdout, 10, 0, gch, GMP_RNDD);
  putchar ('\n');

  mpfr_clears (x, esh, gsh, ech, gch, (mpfr_ptr) 0);
  exit (1);
}

/* check against sinh, cosh */
static void
check (mpfr_t x, mp_rnd_t rnd)
{
  mpfr_t s, c, sx, cx;
  int isc, is, ic;

  mpfr_inits2 (MPFR_PREC(x), s, c, sx, cx, (mpfr_ptr) 0);

  isc = mpfr_sinh_cosh (sx, cx, x, rnd);
  is = mpfr_sinh (s, x, rnd);
  ic = mpfr_cosh (c, x, rnd);

  if (!mpfr_equal_p (s, sx) || !mpfr_equal_p (c, cx))
    failed (x, s, sx, c, cx);
  MPFR_ASSERTN (isc = is || ic);

  mpfr_clears (s, c, sx, cx, (mpfr_ptr) 0);
}

static void
check_nans (void)
{
  mpfr_t  x, sh, ch;

  mpfr_init2 (x, 123);
  mpfr_init2 (sh, 123);
  mpfr_init2 (ch, 123);

  /* nan */
  mpfr_set_nan (x);
  mpfr_sinh_cosh (sh, ch, x, GMP_RNDN);
  MPFR_ASSERTN (mpfr_nan_p (sh));
  MPFR_ASSERTN (mpfr_nan_p (ch));

  /* +inf */
  mpfr_set_inf (x, 1);
  mpfr_sinh_cosh (sh, ch, x, GMP_RNDN);
  MPFR_ASSERTN (mpfr_inf_p (sh));
  MPFR_ASSERTN (mpfr_sgn (sh) > 0);
  MPFR_ASSERTN (mpfr_inf_p (ch));
  MPFR_ASSERTN (mpfr_sgn (ch) > 0);

  /* -inf */
  mpfr_set_inf (x, -1);
  mpfr_sinh_cosh (sh, ch, x, GMP_RNDN);
  MPFR_ASSERTN (mpfr_inf_p (sh));
  MPFR_ASSERTN (mpfr_sgn (sh) < 0);
  MPFR_ASSERTN (mpfr_inf_p (ch));
  MPFR_ASSERTN (mpfr_sgn (ch) > 0);

  mpfr_clear (x);
  mpfr_clear (sh);
  mpfr_clear (ch);
}

int
main (int argc, char *argv[])
{
  int i;
  mpfr_t x;

  tests_start_mpfr ();

  check_nans ();

  /* check against values given by sinh(x), cosh(x) */
  mpfr_init2 (x, 53);
  mpfr_set_str (x, "FEDCBA987654321p-48", 16, GMP_RNDN);
  for (i = 0; i < 10; ++i)
    {
      /* x = i - x / 2 : boggle sign and bits */
      mpfr_ui_sub (x, i, x, GMP_RNDD);
      mpfr_div_2ui (x, x, 2, GMP_RNDD);

      check (x, GMP_RNDN);
      check (x, GMP_RNDU);
      check (x, GMP_RNDD);
    }
  mpfr_clear (x);

  tests_end_mpfr ();
  return 0;
}

#else

int
main (void)
{
  printf ("Warning! Test disabled for this MPFR version.\n");
  return 0;
}

#endif