assert(!signbit(float.nan)); assert(signbit(-float.nan)); assert(!signbit(168.1234f)); assert(signbit(-168.1234f)); assert(!signbit(0.0f)); assert(signbit(-0.0f)); assert(signbit(-float.max)); assert(!signbit(float.max)); assert(!signbit(double.nan)); assert(signbit(-double.nan)); assert(!signbit(168.1234)); assert(signbit(-168.1234)); assert(!signbit(0.0)); assert(signbit(-0.0)); assert(signbit(-double.max)); assert(!signbit(double.max)); assert(!signbit(real.nan)); assert(signbit(-real.nan)); assert(!signbit(168.1234L)); assert(signbit(-168.1234L)); assert(!signbit(0.0L)); assert(signbit(-0.0L)); assert(signbit(-real.max)); assert(!signbit(real.max));
Return true if sign bit of e is set, false if not.