NAME    [Toc]    [Back]

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

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     int
     signbit(real-floating x);

DESCRIPTION    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

     fpclassify(3), math(3)

STANDARDS    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The signbit() macro was added in FreeBSD 5.1.


FreeBSD 5.2.1		       February 11, 2003		 FreeBSD 5.2.1