class    C_point
{
    public float    x;
    public float    y;
    public float    z;
    
    public C_point(float px, float py)
    {
        x = px;
        y = py;
    }
    
    public C_point(float px, float py, float pz)
    {
        x = px;
        y = py;
        z = pz;
    }
    
}