F # Value or constructor undefined, although using get and set

Question

I am a first-year CS student, and not one of them knew about programming. We have just finished our time with functional programming and are now moving on to object-oriented programming. I am currently working on a task in which I must imitate the race between animals. These animals were given some attributes and methods that determine their weight, maximum speed, etc. One of the requirements of the code is that it must generate a random variable that determines its weight for each instance it invokes. So far I have come to this point in my code:

let rnd = System.Random()

type Animal (name:string, animalWeight:float, maxSpeed:float) = class

  let mutable foodInTakePercentage = float(rnd.Next(0,101))

  member val animalMaxSpeed : float = maxSpeed with get, set
  member val animalWeight = animalWeight with get, set
  member val neccesaryFoodIntake = 0.0 with get, set
  member val Name = name
  new (name, maxSpeed) =
    let minWeight = 70.0
    let maxWeight = 300.0
    let Weight = minWeight + rnd.NextDouble() * (maxWeight-minWeight)
    Animal (name, Weight, maxSpeed)
  member this.FoodInTakePercentage = foodInTakePercentage/100.0
  member this.CurrentSpeed =
    this.FoodInTakePercentage*maxSpeed
  abstract FoodIntake : float 
  default this.FoodIntake = 0.5 
  member this.NeccesaryFoodIntake = 
    neccesaryFoodIntake <- animalWeight * FoodIntake

end

type Carnivore (name:string, animalWeight:float, maxSpeed:float) = class
  inherit Animal (name, animalWeight, maxSpeed)
  override this.FoodIntake = 0.08
end

type Herbivore (name:string, animalWeight:float, maxSpeed:float) = class
  inherit Animal (name, animalWeight, maxSpeed)
  override this.FoodIntake = 0.4
end

The problem is that when compiling I get an error:

10g.fsx(22,5): error FS0039: The value or constructor 'neccesaryFoodIntake' is not defined

( ), , . - ?

Answer 1

necessaryFoodIntake , . , . x.necessaryFoodIntake.

, "" , this, :

member this.NeccesaryFoodIntake = 
    this.neccesaryFoodIntake <- animalWeight * FoodIntake

, , necessaryFoodIntake. , , getter (necessaryFoodIntake) (.. unit). getters .

, - , (1) , , (2) ,

member this.CalculateNeccesaryFoodIntake() = 
    this.neccesaryFoodIntake <- animalWeight * FoodIntake

, , , :

member this.NeccesaryFoodIntake = this.neccesaryFoodIntake

, , , , . necessaryFoodIntake , necessaryFoodIntake , private:

member val private neccesaryFoodIntake = 0.0 with get, set

, , .