MathF.Sign(Single) Method
Definition
Returns an integer that indicates the sign of a singleprecision floatingpoint number.
public:
static int Sign(float x);
public static int Sign (float x);
static member Sign : single > int
Public Shared Function Sign (x As Single) As Integer
Parameters
 x
 Single
A signed number.
Returns
A number that indicates the sign of x
, as shown in the following table.
Return value  Meaning 

1  x is less than zero.

0  x is equal to zero.

1  x is greater than zero.

Exceptions
x
is equal to NaN.