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/* Test file for mpfr_tan.
Copyright 2001, 2002, 2003, 2004 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 "mpfr-test.h"
#define TEST_FUNCTION mpfr_tan
#include "tgeneric.c"
static void
check_nans (void)
{
mpfr_t x, y;
mpfr_init2 (x, 123L);
mpfr_init2 (y, 123L);
mpfr_set_nan (x);
mpfr_tan (y, x, GMP_RNDN);
if (! mpfr_nan_p (y))
{
printf ("Error: tan(NaN) != NaN\n");
exit (1);
}
mpfr_set_inf (x, 1);
mpfr_tan (y, x, GMP_RNDN);
if (! mpfr_nan_p (y))
{
printf ("Error: tan(Inf) != NaN\n");
exit (1);
}
mpfr_set_inf (x, -1);
mpfr_tan (y, x, GMP_RNDN);
if (! mpfr_nan_p (y))
{
printf ("Error: tan(-Inf) != NaN\n");
exit (1);
}
mpfr_clear (x);
mpfr_clear (y);
}
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};
tests_start_mpfr ();
check_nans ();
mpfr_init (x);
mpfr_set_prec (x, 2);
mpfr_set_str (x, "0.5", 10, GMP_RNDN);
mpfr_tan (x, x, GMP_RNDD);
if (mpfr_cmp_ui_2exp(x, 1, -1))
{
printf ("mpfr_tan(0.5, GMP_RNDD) failed\n"
"expected 0.5, got");
mpfr_print_binary(x);
putchar('\n');
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))
{
printf ("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))
{
printf ("tan(3*Pi/4) fails for prec=%u\n", prec2[i]);
exit (1);
}
}
mpfr_clear (x);
test_generic (2, 100, 100);
tests_end_mpfr ();
return 0;
}
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