public static int signbit(
	double number
)

Public Shared Function signbit ( 
	number As Double
) As Integer

public:
static int signbit(
	double number
)

static member signbit : 
        number : float -> int 

Parameters

number

Type: SystemDouble
A floating-point number.

Return Value

The function detects the sign bit of zeroes, infinities, and NaN. Along with copysign(Double, Double), signbit(Double) is one of the only two portable ways to examine the sign of NaN.

See signbit in the C standard documentation.

Reference