V3B, Small basic

TextWindow.Write("Voer de waarde in: ")
n = TextWindow.Read()
X = 0
A = 0
B = 1
If n = 0 Then
  TextWindow.WriteLine("Het antwoord is 0.")
Else
  While X <= N
    C = A+B
    teller = 1
    TextWindow.Writeline("Het antwoord is "+C)
    teller = teller + 1
    B = C
    A = B
    X = X+1
  EndWhile
EndIf