SYNOPSIS

     #include <math.h>

     int
     signbit(real-floating x);

DESCRIPTION

     The signbit() macro takes an argument of x and returns non-zero if the
     value of its 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