Scale value

I want to scale a value example:

Value clamp between 27 and 39

I want to scale it to a 0 and 1 value.
Any help?

I found the anwser on the web :

#pragma strict

var min : float;
var max : float;
var i : float;
var normalizedFloat : float;

function Update(){
	//Calculate the normalized float;
    normalizedFloat = (i - min) / (max - min);
    //Clamp the "i" float between "min" value and "max" value
    i = Mathf.Clamp(i, min, max);
    //Clamp the normalized float between 0 and 1
    normalizedFloat = Mathf.Clamp(normalizedFloat, 0, 1);
}

//Source : http://stn.spotfire.com/spotfire_client_help/norm/norm_scale_between_0_and_1.htm

I did this in C#
void PlayerHpLowWarning(float hp)
{

    if (hp <= 0.35)
    {
        float min = 0.0f;
        float max = 0.35f;
        float normalizedFloat;

        //Calculate the normalized float;
        normalizedFloat = (hp - min) / (max - min);
        //Clamp the "nFloat" float between "min" value and "max" value
        hp = Mathf.Clamp(hp, min, max);
        //Clamp the normalized float between 0 and 1
        normalizedFloat = Mathf.Clamp(normalizedFloat, 0, 1);
        //Reverse the normalized float so it works with the float
        normalizedFloat = -1.0f * (normalizedFloat - 1.0f);

        colorHpWarning.a = normalizedFloat;
        playerHpWarning.color = colorHpWarning;
    }
    else
    {
        colorHpWarning.a = 0.0f;
        playerHpWarning.color = colorHpWarning;
    }
}