public override double Interpolate(
	double x,
	double y
)

Public Overrides Function Interpolate ( 
	x As Double,
	y As Double
) As Double

public:
virtual double Interpolate(
	double x, 
	double y
) override

abstract Interpolate : 
        x : float * 
        y : float -> float 
override Interpolate : 
        x : float * 
        y : float -> float