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/* Test file for mpfr_tan.
Copyright 2001, 2002 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The 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 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 MPFR 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 <stdlib.h>
#include <math.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"
void check53 _PROTO ((double, double, mp_rnd_t));
void
check53 (double x, double tan_x, mp_rnd_t rnd_mode)
{
mpfr_t xx, s;
mpfr_init2 (xx, 53);
mpfr_init2 (s, 53);
mpfr_set_d (xx, x, rnd_mode); /* should be exact */
mpfr_tan (s, xx, rnd_mode);
if (mpfr_get_d (s) != tan_x && (!isnan(tan_x) || !isnan(mpfr_get_d(s)))) {
fprintf (stderr, "mpfr_tan failed for x=%1.20e, rnd=%s\n", x,
mpfr_print_rnd_mode (rnd_mode));
fprintf (stderr, "mpfr_tan gives tan(x)=%1.20e, expected %1.20e\n",
mpfr_get_d (s), tan_x);
exit(1);
}
mpfr_clear (xx);
mpfr_clear (s);
}
#define TEST_FUNCTION mpfr_tan
#include "tgeneric.c"
int
main(int argc, char *argv[])
{
mpfr_t x;
unsigned int i;
unsigned int prec[10] = {14, 15, 19, 22, 23, 24, 25, 40, 41, 52};
unsigned int prec2[10] = {4, 5, 6, 19, 70, 95, 100, 106, 107, 108};
check53(0.0/0.0, 0.0/0.0, GMP_RNDN);
check53(1.0/0.0, 0.0/0.0, GMP_RNDN);
check53(-1.0/0.0, 0.0/0.0, GMP_RNDN);
mpfr_init (x);
mpfr_set_prec (x, 2);
mpfr_set_d (x, 0.5, GMP_RNDN);
mpfr_tan (x, x, GMP_RNDD);
if (mpfr_get_d (x) != 0.5)
{
fprintf (stderr, "mpfr_tan(0.5, GMP_RNDD) failed\n");
fprintf (stderr, "expected 0.5, got %f\n", mpfr_get_d (x));
exit (1);
}
/* check that tan(3*Pi/4) ~ -1 */
for (i=0; i<10; i++)
{
mpfr_set_prec (x, prec[i]);
mpfr_const_pi (x, GMP_RNDN);
mpfr_mul_ui (x, x, 3, GMP_RNDN);
mpfr_div_ui (x, x, 4, GMP_RNDN);
mpfr_tan (x, x, GMP_RNDN);
if (mpfr_cmp_si (x, -1))
{
fprintf (stderr, "tan(3*Pi/4) fails for prec=%u\n", prec[i]);
exit (1);
}
}
/* check that tan(7*Pi/4) ~ -1 */
for (i=0; i<10; i++)
{
mpfr_set_prec (x, prec2[i]);
mpfr_const_pi (x, GMP_RNDN);
mpfr_mul_ui (x, x, 7, GMP_RNDN);
mpfr_div_ui (x, x, 4, GMP_RNDN);
mpfr_tan (x, x, GMP_RNDN);
if (mpfr_cmp_si (x, -1))
{
fprintf (stderr, "tan(3*Pi/4) fails for prec=%u\n", prec2[i]);
exit (1);
}
}
mpfr_clear (x);
test_generic (2, 100, 100);
return 0;
}
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