ComputerCraft Block Area Calculator

--Find the area and perimeter
tArgs = {...}
local mode = tArgs[1]
local length = tArgs[2]
local width = tArgs[3]
local height = tArgs[4]

local area = 0
local stack64 = 0
local stack16 = 0

function calcArea3d(l,w,h)
  area = l * w * h
  stack64 = math.ceil(area / 64)
  stack16 = math.ceil(area / 16)
end
function calcArea2d(l,w)
    area = l * w
    stack64 = math.ceil(area / 64)
    stack16 = math.ceil(area / 16)
end
function report()
  local biggest = 0
  if #tostring(length) > biggest then biggest = #tostring(length) end
  if #tostring(width) > biggest then biggest = #tostring(width) end
  if #tostring(height) > biggest then biggest = #tostring(height) end
  print("================================")
  print("  Length: " .. string.rep(" ", biggest-#tostring(length)) .. length)
  print("  Width:  " .. string.rep(" ", biggest-#tostring(width)) .. width)
  print("  Height: " .. string.rep(" ", biggest-#tostring(height)) .. height)
  print(" ------------------------------")

  biggest = 0
  local tmpArea = area .. " Blocks"
  local tmpStack64 = "~" .. stack64 .. " (x64)"
  local tmpStack16 = "~" .. stack16 .. " (x16)"

  if #tmpArea > biggest then biggest = #tmpArea end
  if #tmpStack64 > biggest then biggest = #tmpStack64 end
  if #tmpStack16 > biggest then biggest = #tmpStack16 end

  print("  Blocks Required: " .. string.rep(" ",biggest - #tmpArea ) .. tmpArea )
  print("  Stacks Required: " .. string.rep(" ",biggest - #tmpStack64) .. tmpStack64 )
  print("  Stacks Required: " .. string.rep(" ",biggest - #tmpStack16) .. tmpStack16 )
  print("================================")
  print("By zachdyer and da404lewzer.")
end
function help()

end

if mode == nil then
  print("help")
elseif mode == "area3d" then
    if length == nil then
       help()
    elseif width == nil then
      width = length
      height = length
      calcArea3d(length,width,height)
      report()
    elseif height == nil then
      help()
    else
       calcArea3d(length,width,height)
       report()
    end
elseif mode == "area2d" then
  if length == nil then
    help()
  elseif width == nil then
    width = length
    calcArea2d(length, width)
    report()
  else
    calcArea2d(length, width)
    report()
  end
end