+ /* Positive numbers. */
+ ASSERT (!signbit (my_ceilf (0.3f)));
+ ASSERT (!signbit (my_ceilf (0.7f)));
+ /* Negative numbers. */
+ ASSERT (!!signbit (my_ceilf (-0.3f)) == !!signbit (minus_zerof));
+ ASSERT (!!signbit (my_ceilf (-0.7f)) == !!signbit (minus_zerof));