Manual Pages — SIGNBIT
– determine whether a floating-point number's sign is negative
Math Library (libm, -lm)
macro takes an argument of
and returns non-zero if the value of its sign is negative, otherwise 0.
macro conforms to
ISO/IEC 9899:1999 ("ISO C99").
macro was added in
FreeBSD 5.1 .
||July 18, 2004
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