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Annotation of OpenXM_contrib/gmp/mpfr/tests/ttan.c, Revision 1.1.1.1

1.1       ohara       1: /* Test file for mpfr_tan.
                      2:
                      3: Copyright 2001, 2002 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the MPFR Library.
                      6:
                      7: The MPFR Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The MPFR Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include <stdio.h>
                     23: #include <stdlib.h>
                     24: #include <math.h>
                     25: #include "gmp.h"
                     26: #include "mpfr.h"
                     27: #include "mpfr-impl.h"
                     28: #include "mpfr-test.h"
                     29:
                     30: void check53 _PROTO ((double, double, mp_rnd_t));
                     31:
                     32: void
                     33: check53 (double x, double tan_x, mp_rnd_t rnd_mode)
                     34: {
                     35:   mpfr_t xx, s;
                     36:
                     37:   mpfr_init2 (xx, 53);
                     38:   mpfr_init2 (s, 53);
                     39:   mpfr_set_d (xx, x, rnd_mode); /* should be exact */
                     40:   mpfr_tan (s, xx, rnd_mode);
                     41:   if (mpfr_get_d1 (s) != tan_x && (!isnan(tan_x) || !mpfr_nan_p(s))) {
                     42:     fprintf (stderr, "mpfr_tan failed for x=%1.20e, rnd=%s\n", x,
                     43:             mpfr_print_rnd_mode (rnd_mode));
                     44:     fprintf (stderr, "mpfr_tan gives tan(x)=%1.20e, expected %1.20e\n",
                     45:             mpfr_get_d1 (s), tan_x);
                     46:     exit(1);
                     47:   }
                     48:   mpfr_clear (xx);
                     49:   mpfr_clear (s);
                     50: }
                     51:
                     52: #define TEST_FUNCTION mpfr_tan
                     53: #include "tgeneric.c"
                     54:
                     55: int
                     56: main(int argc, char *argv[])
                     57: {
                     58:   mpfr_t x;
                     59:   unsigned int i;
                     60:   unsigned int prec[10] = {14, 15, 19, 22, 23, 24, 25, 40, 41, 52};
                     61:   unsigned int prec2[10] = {4, 5, 6, 19, 70, 95, 100, 106, 107, 108};
                     62:
                     63: #ifdef HAVE_INFS
                     64:   check53 (DBL_NAN, DBL_NAN, GMP_RNDN);
                     65:   check53 (DBL_POS_INF, DBL_NAN, GMP_RNDN);
                     66:   check53 (DBL_NEG_INF, DBL_NAN, GMP_RNDN);
                     67: #endif
                     68:
                     69:   mpfr_init (x);
                     70:
                     71:   mpfr_set_prec (x, 2);
                     72:   mpfr_set_d (x, 0.5, GMP_RNDN);
                     73:   mpfr_tan (x, x, GMP_RNDD);
                     74:   if (mpfr_get_d1 (x) != 0.5)
                     75:     {
                     76:       fprintf (stderr, "mpfr_tan(0.5, GMP_RNDD) failed\n");
                     77:       fprintf (stderr, "expected 0.5, got %f\n", mpfr_get_d1 (x));
                     78:       exit (1);
                     79:     }
                     80:
                     81:   /* check that tan(3*Pi/4) ~ -1 */
                     82:   for (i=0; i<10; i++)
                     83:     {
                     84:       mpfr_set_prec (x, prec[i]);
                     85:       mpfr_const_pi (x, GMP_RNDN);
                     86:       mpfr_mul_ui (x, x, 3, GMP_RNDN);
                     87:       mpfr_div_ui (x, x, 4, GMP_RNDN);
                     88:       mpfr_tan (x, x, GMP_RNDN);
                     89:       if (mpfr_cmp_si (x, -1))
                     90:         {
                     91:           fprintf (stderr, "tan(3*Pi/4) fails for prec=%u\n", prec[i]);
                     92:           exit (1);
                     93:         }
                     94:     }
                     95:
                     96:   /* check that tan(7*Pi/4) ~ -1 */
                     97:   for (i=0; i<10; i++)
                     98:     {
                     99:       mpfr_set_prec (x, prec2[i]);
                    100:       mpfr_const_pi (x, GMP_RNDN);
                    101:       mpfr_mul_ui (x, x, 7, GMP_RNDN);
                    102:       mpfr_div_ui (x, x, 4, GMP_RNDN);
                    103:       mpfr_tan (x, x, GMP_RNDN);
                    104:       if (mpfr_cmp_si (x, -1))
                    105:         {
                    106:           fprintf (stderr, "tan(3*Pi/4) fails for prec=%u\n", prec2[i]);
                    107:           exit (1);
                    108:         }
                    109:     }
                    110:
                    111:   mpfr_clear (x);
                    112:
                    113:   test_generic (2, 100, 100);
                    114:
                    115:   return 0;
                    116: }