DragonFly On-Line Manual Pages

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

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

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)

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

HISTORY
     The signbit() macro was added in DragonFly 1.3.

DragonFly 5.9-DEVELOPMENT       March 28, 2020       DragonFly 5.9-DEVELOPMENT