platform

function forward()
	while not turtle.forward() do
		turtle.dig()
		sleep(0.2)
	end
	if not turtle.detectDown() then
		b=1
		for i=1, 15 do
			if b==1 then
				if turtle.getItemCount(i)==0 then
					turtle.select(i+1)
				else
					b=2
				end
			end
		end
		turtle.placeDown()
	end
end

print("Laenge: ")
laenge=io.read()
print("\nBreite: ")
breite=io.read()

x=0

for i=0, laenge-1 do
	for i2=0, breite-1 do
		forward()
	end
	if x==0 then
		turtle.turnRight()
		forward()
		turtle.turnRight()
		x=1
	else
		x=0
		turtle.turnLeft()
		forward()
		turtle.turnLeft()
	end

end