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/* Test file for mpfr_log10.
Copyright 2001, 2002, 2003, 2004 Free Software Foundation.
Adapted from tsinh.c.
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_log10
#include "tgeneric.c"
int
main (int argc, char *argv[])
{
mpfr_t x, y;
unsigned int n;
tests_start_mpfr ();
test_generic (2, 100, 20);
mpfr_init2 (x, 53);
mpfr_init2 (y, 53);
/* check NaN */
mpfr_set_nan (x);
mpfr_log10 (y, x, GMP_RNDN);
MPFR_ASSERTN(mpfr_nan_p (y));
/* check Inf */
mpfr_set_inf (x, -1);
mpfr_log10 (y, x, GMP_RNDN);
MPFR_ASSERTN(mpfr_nan_p (y));
mpfr_set_inf (x, 1);
mpfr_log10 (y, x, GMP_RNDN);
MPFR_ASSERTN(mpfr_inf_p (y) && mpfr_sgn (y) > 0);
/* check negative argument */
mpfr_set_si (x, -1, GMP_RNDN);
mpfr_log10 (y, x, GMP_RNDN);
MPFR_ASSERTN(mpfr_nan_p (y));
/* check log10(1) = 0 */
mpfr_set_ui (x, 1, GMP_RNDN);
mpfr_log10 (y, x, GMP_RNDN);
MPFR_ASSERTN((mpfr_cmp_ui (y, 0) == 0) && (MPFR_IS_POS (y)));
/* check log10(10^n)=n */
mpfr_set_ui (x, 1, GMP_RNDN);
for (n = 1; n <= 15; n++)
{
mpfr_mul_ui (x, x, 10, GMP_RNDN); /* x = 10^n */
mpfr_log10 (y, x, GMP_RNDN);
if (mpfr_cmp_ui (y, n) )
{
printf ("log10(10^n) <> n for n=%u\n", n);
exit (1);
}
}
mpfr_clear (x);
mpfr_clear (y);
tests_end_mpfr ();
return 0;
}
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