mc_stairs

-- This program digs a 5 x 5 stairwell down to bedrock

-- Functions
function cut(blocks)  -- this function is used to cut the initial run of five steps
  for z = 1, blocks do
    turtle.dig()
    turtle.forward()
    end
  end

function cutStep()  -- this function cuts a 4 block high step
  for y = 1, (size - 1) do
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.digUp()
    turtle.up()
    turtle.digUp()
    turtle.down()
    turtle.down()
    end
  end

-- Main program control section

size = 5
for a = 1, size do  -- Cut the initial steps
  turtle.digDown()
  turtle.down()
  cut(size - a)
     if (size - (a + 1)) > 0 then
      for b = 1, (size - (a + 1)) do
        turtle.back()
      end
    end
  end

for c = 2, 17 do  -- Cut subsequent courses of steps
  turtle.turnRight()
  cutStep()
  end