BuildWalls

function UP()
  while not(turtle.up()) do
    turtle.digUp()
    turtle.attackUp()
  end
end

function DOWN()
  while not(turtle.down()) do
    turtle.digDown()
    turtle.attackDown()
  end
end

function FORWARD()
  while not(turtle.forward()) do
    turtle.dig()
    turtle.attack()
  end
end

function Name()
  return turtle.getItemDetail().name
end

function Select(material)
  if pcall(Name) then
    if Name() == material then
      return true
    end
  end
  for i=1,16,1 do
    turtle.select(i)
    if pcall(Name) then
      if Name() == material then
        return true
      end
    end
  end
write("Need more ")
write(material)
write("!")
print("Press ENTER to continue...")
read()
return Select(material)
end

function BuildColoumnUp(y,material)
  for i=1,y,1 do
    UP()
    Select(material)
    turtle.placeDown()
  end
  FORWARD()
  DOWN()
end

function BuildColoumnDown(y,material)
  for i=1,y,1 do
    DOWN()
    Select(material)
    turtle.placeUp()
  end
  FORWARD()
  UP()
end

function BuildRow(x,y,material)
  if (x % 2 == 0) then
    for i=1,x/2,1 do
      BuildColoumnUp(y,material)
      BuildColoumnDown(y,material)
    end
  else
    for i=1,(x-1)/2,1 do
      BuildColoumnUp(y,material)
      BuildColoumnDown(y,material)
    end
    BuildColoumnUp(y,material)
    for i=2,y,1 do
      DOWN()
    end
  end
end

function BuildWalls(x,y,z,material)
  for i=0,1,1 do
    BuildRow(x,y,material)
    turtle.turnRight()
    FORWARD()
    BuildRow(z,y,material)
    turtle.turnRight()
    FORWARD()
  end
end

print("---------------------")
write("Height: ")
y = read()
write("Length: ")
x = read()
write("Width: ")
z = read()
write("Material: ")
material = read()
print("Building....")
BuildWalls(x,y,z,material)
print("Done!")