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Annotation of OpenXM_contrib/gmp/mpfr/tests/tatan.c, Revision 1.1

1.1     ! ohara       1: /* Test file for mpfr_arctan.
        !             2:
        !             3: Copyright 2001, 2002 Free Software Foundation.
        !             4: Written by Paul Zimmermann, INRIA Lorraine.
        !             5:
        !             6: This file is part of the MPFR Library.
        !             7:
        !             8: The MPFR Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Lesser General Public License as published by
        !            10: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The MPFR Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Lesser General Public License
        !            19: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include <stdio.h>
        !            24: #include <stdlib.h>
        !            25: #include "gmp.h"
        !            26: #include "mpfr.h"
        !            27: #include "mpfr-test.h"
        !            28:
        !            29: void worst_cases _PROTO((void));
        !            30: int mpfr_arctan_aux2 _PROTO((mpfr_ptr, mpfr_srcptr, mp_rnd_t));
        !            31:
        !            32: void
        !            33: worst_cases (void)
        !            34: {
        !            35:   mpfr_t x, y, z;
        !            36:
        !            37:   mpfr_init2 (x, 53);
        !            38:   mpfr_init2 (y, 53);
        !            39:   mpfr_init2 (z, 53);
        !            40:
        !            41:   mpfr_set_str_raw (x, "1.0000100110000001100111100011001110101110100111011101");
        !            42:   mpfr_set_str_raw (y, "1.1001101101110100101100110011011101101000011010111110e-1");
        !            43:   mpfr_atan (z, x, GMP_RNDN);
        !            44:   if (mpfr_cmp (y, z))
        !            45:     {
        !            46:       fprintf (stderr, "Error in mpfr_atan for prec=53, rnd=GMP_RNDN\n");
        !            47:       fprintf (stderr, "x=");
        !            48:       mpfr_out_str (stderr, 2, 0, x, GMP_RNDN);
        !            49:       fprintf (stderr, "\nexpected ");
        !            50:       mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
        !            51:       fprintf (stderr, "\ngot      ");
        !            52:       mpfr_out_str (stderr, 2, 0, z, GMP_RNDN);
        !            53:       fprintf (stderr, "\n");
        !            54:       exit (1);
        !            55:     }
        !            56:
        !            57:   mpfr_clear (x);
        !            58:   mpfr_clear (y);
        !            59:   mpfr_clear (z);
        !            60: }
        !            61:
        !            62: int
        !            63: main (int argc, char *argv[])
        !            64: {
        !            65:   unsigned int prec, err, yprec, n, p0 = 2, p1 = 100, N = 10;
        !            66:   mp_rnd_t rnd;
        !            67:   mpfr_t x, y, z, t;
        !            68:
        !            69:   worst_cases ();
        !            70:
        !            71:   mpfr_init (x);
        !            72:   mpfr_init (y);
        !            73:   mpfr_init (z);
        !            74:   mpfr_init (t);
        !            75:
        !            76:   /* tarctan prec - perform one random computation with precision prec */
        !            77:   if (argc >= 2)
        !            78:     {
        !            79:       p0 = p1 = atoi (argv[1]);
        !            80:       N = 1;
        !            81:     }
        !            82:
        !            83:   for (prec = p0; prec <= p1; prec++)
        !            84:     {
        !            85:       mpfr_set_prec (x, prec);
        !            86:       mpfr_set_prec (z, prec);
        !            87:       mpfr_set_prec (t, prec);
        !            88:       yprec = prec + 10;
        !            89:
        !            90:       for (n=0; n<N; n++)
        !            91:        {
        !            92:          mpfr_random (x);
        !            93:          rnd = random () % 4;
        !            94:          mpfr_set_prec (y, yprec);
        !            95:          mpfr_atan (y, x, rnd);
        !            96:          err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
        !            97:          if (mpfr_can_round (y, err, rnd, rnd, prec))
        !            98:            {
        !            99:              mpfr_set (t, y, rnd);
        !           100:              mpfr_atan (z, x, rnd);
        !           101:              if (mpfr_cmp (t, z))
        !           102:                {
        !           103:                  printf ("results differ for x=");
        !           104:                  mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
        !           105:                  printf (" prec=%u rnd_mode=%s\n", prec,
        !           106:                          mpfr_print_rnd_mode (rnd));
        !           107:                  printf ("   got ");
        !           108:                  mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
        !           109:                  putchar ('\n');
        !           110:                  printf ("   expected ");
        !           111:                  mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
        !           112:                  putchar ('\n');
        !           113:                  printf ("   approximation was ");
        !           114:                  mpfr_print_binary (y);
        !           115:                  putchar ('\n');
        !           116:                  exit (1);
        !           117:                }
        !           118:            }
        !           119:        }
        !           120:     }
        !           121:
        !           122:   mpfr_clear (x);
        !           123:   mpfr_clear (y);
        !           124:   mpfr_clear (z);
        !           125:   mpfr_clear (t);
        !           126:
        !           127:   return 0;
        !           128: }