hpux man page for signbit

signbit(3M)															       signbit(3M)

NAME
       signbit() - 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 argument 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 argument value is negative.

       The macro raises no exceptions.

ERRORS
       No errors are defined.

EXAMPLES
       Take certain actions if is negative zero:

SEE ALSO
       fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math(5).

STANDARDS CONFORMANCE
       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																       signbit(3M)