signbit(3M)signbit(3M)NAMEsignbit() - floating-point sign-determination
SYNOPSIS
floating-type
DESCRIPTION
The macro determines whether the sign of its argument value (which may
be a floating-point number, zero, infinity, or NaN) is negative. The
argument must be of floating type. For HP Integrity servers, the argu‐
ment can be any floating type. For PA-RISC, the argument must be
either or
USAGE
To use the macro, compile either with the default option or with the
and options. Make sure your program includes Link in the math library
by specifying on the compiler or linker command line.
RETURN VALUE
The macro returns a nonzero value if and only if the sign of its argu‐
ment value is negative.
The macro raises no exceptions.
ERRORS
No errors are defined.
EXAMPLES
Take certain actions if is negative zero:
SEE ALSOfpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M),
math(5).
STANDARDS CONFORMANCE
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arith‐
metic'')
signbit(3M)