Turtle Builder: Cactus Farm 0.4

-- Slot 1: Cobble
-- Slot 2: Sand
-- Slot 3: Cactus
-- Slot 4: Fence
local cactusPerTower = 3

local i = 0
while(i<cactusPerTower) do
turtle.select(1)
turtle.placeDown()
turtle.up()
turtle.select(2)
turtle.placeDown()
turtle.up()
turtle.select(3)
turtle.placeDown()
turtle.up()
turtle.up()
i = i + 1
end
turtle.forward()
turtle.forward()
i = 0
while(i<cactusPerTower) do
turtle.down()
turtle.select(4)
turtle.placeDown()
turtle.down()
turtle.down()
turtle.down()
i = i + 1
end