signbit(3) [osx man page]

SIGNBIT(3)						   BSD Library Functions Manual 						SIGNBIT(3)

NAME

     signbit -- determine whether a floating-point number's sign is negative

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <math.h>

     int
     signbit(real-floating x);

DESCRIPTION

     The signbit() macro takes an argument of x.  It returns non-zero if the value of the argument's sign is negative, otherwise 0.

SEE ALSO

     fpclassify(3), math(3)

STANDARDS

     The signbit() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								 February 11, 2003							       BSD

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)