DragonFly On-Line Manual Pages

SIGNBIT(3)	      DragonFly Library Functions Manual	    SIGNBIT(3)

NAME
     signbit -- test sign

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <math.h>

     int
     signbit(real-floating x);

DESCRIPTION
     The signbit() macro determines whether the sign of its argument value x
     is negative.  An argument represented in a format wider than its semantic
     type is converted to its semantic type first.  The determination is then
     based on the type of the argument.

RETURN VALUES
     The signbit() macro returns a non-zero value if the sign of its value x
     is negative.  Otherwise 0 is returned.

ERRORS
     No errors are defined.

SEE ALSO
     fpclassify(3), isfinite(3), isnormal(3), math(3)

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

DragonFly 3.5		       October 29, 2003 		 DragonFly 3.5