62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/* Test of splitting a double into fraction and mantissa.
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Copyright (C) 2012-2024 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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static void
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test_function (void)
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{
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/* [MX] shaded specification in POSIX. */
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/* NaN. */
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{
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int exp = -9999;
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DOUBLE mantissa;
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mantissa = FREXP (NAN, &exp);
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ASSERT (ISNAN (mantissa));
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}
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/* Signed zero. */
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{
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int exp = -9999;
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DOUBLE mantissa;
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mantissa = FREXP (L_(0.0), &exp);
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ASSERT (mantissa == L_(0.0));
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ASSERT (!signbit (mantissa));
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ASSERT (exp == 0);
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}
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{
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int exp = -9999;
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DOUBLE mantissa;
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mantissa = FREXP (MINUS_ZERO, &exp);
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ASSERT (mantissa == L_(0.0));
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ASSERT (!!signbit (mantissa) == !!signbit (MINUS_ZERO));
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ASSERT (exp == 0);
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}
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/* Infinity. */
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{
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int exp = -9999;
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DOUBLE mantissa;
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mantissa = FREXP (INFINITY, &exp);
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ASSERT (mantissa == INFINITY);
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}
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{
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int exp = -9999;
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DOUBLE mantissa;
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mantissa = FREXP (- INFINITY, &exp);
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ASSERT (mantissa == - INFINITY);
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}
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}
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