Test

term.write("Wie lang soll die Fläche sein?")
local lol = read()
while turtle.getFuelLevel() < lol*7 do
 local q = turtle.getFuelLevel()
  if turtle.getFuelLevel() < lol*7 then
   term.write("Fuel Level is at "..q.." But needs to be "..lol*7)
   term.write("Please put Fuel in 1st slot")
   os.sleep(5)
   turtle.refuel()
  end
end

term.write("Wie breit soll die Fläche sein?")
local lob = read()
while turtle.getFuelLevel() < lob*7 do
 local q = turtle.getFuelLevel()
  if turtle.getFuelLevel() < lob*7 then
   term.write("Fuel Level is at "..q.." But needs to be "..lob*7)
   term.write("Please put Fuel in 1st slot")
   os.sleep(5)
   turtle.refuel()
  end
end
   term.write("Baue eine "..lol.." lange und "..lob.." breite Fläche")

for b =1,lob do

   for a = 1,lol do
      turtle.dig()
      turtle.placeDown()
      turtle.forward()
     end

   for a = 1,1 do
      turtle.placeDown()
      turtle.turnRight()
      turtle.forward()
      turtle.turnRight()
     end

   for a = 1,lol do
      turtle.dig()
      turtle.placeDown()
      turtle.forward()
     end

   for a = 1,1 do
      turtle.placeDown()
      turtle.turnLeft()
      turtle.forward()
      turtle.turnLeft()
     end

end
   for c = 1,16 do
    turtle.select(c)
   end
 turtle.select(1)
term.write("Fertig")
term.write("Fertig")
term.write("Fertig")