function one()
print("Hello")
end
function two()
print("Hey")
end
function three()
print("Hi")
end
local menuOptions = {"1", "2", "3"}
local termX, termY = term.getSize()
local selected = 1
local strSeperator = string.rep(" ",5)
function centerText(text, termY)
term.setCursorPos(termX/2-#text/2, termY)
term.write(text)
end
function start()
while true do
  term.clear()
  local strMenuLine = "|"
  for i,v in ipairs(menuOptions) do
   if i == selected then
    strMenuLine = strMenuLine..strSeperator.."["..v.."]"
   else
    strMenuLine = strMenuLine..strSeperator.." "..v.." "
   end
   strMenuLine = strMenuLine..strSeperator.."|"
  end
  centerText("+"..string.rep("-",(#strMenuLine-2)).."+",1)
  centerText(strMenuLine,2)
  centerText("+"..string.rep("-",(#strMenuLine-2)).."+",3)
  local id, key = os.pullEvent()
  if id == "key" then
   if key == 205 then
    selected = selected + 1
    if selected > #menuOptions then
     selected = 1
    end
   elseif key == 203 then
    selected = selected - 1
    if selected < 1 then
     selected = #menuOptions
    end
   elseif key == 28 then
    return selected
   end
  end
end
end
x = start()
print()
if x == 1 then
one()
end
if x == 2 then
two()
end
if x == 3 then
three()
end