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/* Test of splitting a 'long double' into fraction and mantissa.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
#include "printf-frexpl.h"
#include <float.h>
#include <stdlib.h>
#define ASSERT(expr) if (!(expr)) abort ();
static long double
my_ldexp (long double x, int d)
{
for (; d > 0; d--)
x *= 2.0L;
for (; d < 0; d++)
x *= 0.5L;
return x;
}
int
main ()
{
int i;
long double x;
for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.0L);
}
for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.0L);
}
for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == LDBL_MIN_EXP - 1);
ASSERT (mantissa == my_ldexp (1.0L, i - LDBL_MIN_EXP));
}
for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.01L);
}
for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.01L);
}
for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == LDBL_MIN_EXP - 1);
ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
ASSERT (mantissa == my_ldexp (x, - exp));
}
for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.73205L);
}
for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.73205L);
}
for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = printf_frexpl (x, &exp);
ASSERT (exp == LDBL_MIN_EXP - 1);
ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
ASSERT (mantissa == my_ldexp (x, - exp));
}
return 0;
}
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