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

1.1       ohara       1: /* Test file for mpfr_trunc, mpfr_floor, mpfr_ceil, mpfr_round.
                      2:
                      3: Copyright 2002 Free Software Foundation.
                      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 "gmp.h"
                     25: #include "mpfr.h"
                     26: #include "mpfr-test.h"
                     27:
                     28: int
                     29: main (void)
                     30: {
                     31:   mp_size_t s;
                     32:   mpz_t z;
                     33:   mp_prec_t p;
                     34:   mpfr_t x, y, t;
                     35:   mp_rnd_t r;
                     36:   int inexact, sign_t;
                     37:
                     38:   mpfr_init (x);
                     39:   mpfr_init (y);
                     40:   mpz_init (z);
                     41:   mpfr_init (t);
                     42:   mpz_set_ui (z, 1);
                     43:   for (s = 2; s < 100; s++)
                     44:     {
                     45:       /* z has exactly s bits */
                     46:
                     47:       mpz_mul_2exp (z, z, 1);
                     48:       if (LONG_RAND () % 2)
                     49:         mpz_add_ui (z, z, 1);
                     50:       mpfr_set_prec (x, s);
                     51:       mpfr_set_prec (t, s);
                     52:       if (mpfr_set_z (x, z, GMP_RNDN))
                     53:         {
                     54:           fprintf (stderr, "Error: mpfr_set_z should be exact (s = %u)\n",
                     55:                    (unsigned int) s);
                     56:           exit (1);
                     57:         }
                     58:       for (p=2; p<100; p++)
                     59:         {
                     60:           mpfr_set_prec (y, p);
                     61:           for (r=0; r<4; r++)
                     62:             {
                     63:               if (r == GMP_RNDN)
                     64:                 inexact = mpfr_round (y, x);
                     65:               else if (r == GMP_RNDZ)
                     66:                 inexact = mpfr_trunc (y, x);
                     67:               else if (r == GMP_RNDU)
                     68:                 inexact = mpfr_ceil (y, x);
                     69:               else /* r = GMP_RNDD */
                     70:                 inexact = mpfr_floor (y, x);
                     71:               if (mpfr_sub (t, y, x, GMP_RNDN))
                     72:                 {
                     73:                   fprintf (stderr, "Error: subtraction should be exact\n");
                     74:                   exit (1);
                     75:                 }
                     76:               sign_t = mpfr_cmp_ui (t, 0);
                     77:               if (((inexact == 0) && (sign_t != 0)) ||
                     78:                   ((inexact < 0) && (sign_t >= 0)) ||
                     79:                   ((inexact > 0) && (sign_t <= 0)))
                     80:                 {
                     81:                   fprintf (stderr, "Wrong inexact flag\n");
                     82:                   exit (1);
                     83:                 }
                     84:             }
                     85:         }
                     86:     }
                     87:   mpfr_clear (x);
                     88:   mpfr_clear (y);
                     89:   mpz_clear (z);
                     90:   mpfr_clear (t);
                     91:
                     92:   return 0;
                     93: }