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/* Test of splitting a double into fraction and mantissa.
Copyright (C) 2012-2019 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
static void
test_function (void)
{
/* [MX] shaded specification in POSIX. */
/* NaN. */
{
int exp = -9999;
DOUBLE mantissa;
mantissa = FREXP (NAN, &exp);
ASSERT (ISNAN (mantissa));
}
/* Signed zero. */
{
int exp = -9999;
DOUBLE mantissa;
mantissa = FREXP (L_(0.0), &exp);
ASSERT (mantissa == L_(0.0));
ASSERT (!signbit (mantissa));
ASSERT (exp == 0);
}
{
int exp = -9999;
DOUBLE mantissa;
mantissa = FREXP (MINUS_ZERO, &exp);
ASSERT (mantissa == L_(0.0));
ASSERT (!!signbit (mantissa) == !!signbit (MINUS_ZERO));
ASSERT (exp == 0);
}
/* Infinity. */
{
int exp = -9999;
DOUBLE mantissa;
mantissa = FREXP (INFINITY, &exp);
ASSERT (mantissa == INFINITY);
}
{
int exp = -9999;
DOUBLE mantissa;
mantissa = FREXP (- INFINITY, &exp);
ASSERT (mantissa == - INFINITY);
}
}
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