View difference between Paste ID: zYe0zrHp and u4a5Zf99

 os.pullEvent = os.pullEventRaw
 checkoutcomputer = 32
 alogin = "adminpassword"
 
 function connect()
     rednet.open("bottom")
 end
 
 success = pcall(connect)
 if not success then
 	os.reboot()
 end
 
 monitor = peripheral.wrap("top")
 if not monitor then
 	os.reboot()
 end
 
 function displayBalance(balance)
 	monitor.clear()
 	monitor.setCursorPos(1, 2)
 	monitor.write("Welcome!")
 	monitor.setCursorPos(1, 4)
 	monitor.write("$" .. balance)
 end
 
 function checkOut(balance)
 	success = false
 	while success ~= "true" do
 		rednet.send(checkoutcomputer, balance)
 		id, success = rednet.receive()
 	end
 	print("SUCCESS!")
 end
 
 function evaluateFormula(formula)
     -- Load the formula as a Lua function
     local func, err = load("return " .. formula)
 
     -- Check if there was an error compiling the formula
     if not func then
         return nil, "Invalid formula: " .. err
     end
 
     -- Execute the function and return the result
     local success, result = pcall(func)
     if success then
         return result
     else
         return nil, "Error evaluating formula: " .. result
     end
 end
 
 balance = 0
 displayBalance(balance)
 
 while true do
 	print("type end to confirm order \n")
 	print("Current Order: $" .. balance)
 	input = io.read()
 	if input == alogin then
 		os.exit(1)
 	end
 	if input == "end" then
 		checkOut(balance)
 		break
 	end
 	if input ~= 0 then
 		change = evaluateFormula(input)
 		if change then
 			balance = balance + change
 		end
 		displayBalance(balance)
 	end
 end
 monitor.clear()
 monitor.setCursorPos(1, 2)
 monitor.write("Thank")
 monitor.setCursorPos(1, 4)
 monitor.write("You!")
 os.sleep(5)
 displayBalance(0)