[Learning] Calculadora Simples

getNumbers = function(operation)
    os.execute("cls")
    local n = {}
    for k,v in next,{"primeiro","segundo"} do
        io.write("Digite o "..v.." numero para a "..operation..": ")
        n[#n+1] = io.read()
    end
    return n
end

menu = function()
    os.execute("cls")
    local choice
    local operations = {{"adicao",'+'},{"subtracao",'-'},{"multiplicacao",'*'},{"divisao",'/'},{"exponenciacao",'^'}}
    io.write("Informe o numero correspondente a uma das operacoes abaixo:\n")
    for k,v in next,operations do
        io.write(string.format("\t%d -> Operacao aritmetica de %s (X%sY)\n",k,v[1],v[2]))
    end
    io.write("\n> ")
    choice = io.read()
    choice = tonumber(choice)
    local numbers = getNumbers(operations[choice][1])
    os.execute("cls")
    io.write("A "..operations[choice][1].." entre "..numbers[1].." e "..numbers[2].." é: "..tostring(load("return "..numbers[1]..operations[choice][2]..numbers[2])()))
    os.execute("pause >nul")
    menu()
end

menu()