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SIGNBIT(3) BSD Library Functions Manual SIGNBIT(3)
signbit -- test sign
Standard C Library (libc, -lc)
The signbit() macro determines whether the sign of its argument value x is negative. An
argument represented in a format wider than its semantic type is converted to its semantic
type first. The determination is then based on the type of the argument.
The sign is determined for all values, including infinities, zeroes, and NaNs
The sign is determined for finites, true zeros, and dirty zeroes; for ROPs the sign is
The signbit() macro returns a non-zero value if the sign of its value x is negative. Other-
wise 0 is returned.
No errors are defined.
fpclassify(3), isfinite(3), isnormal(3), math(3)
The signbit() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
BSD October 29, 2003 BSD
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