function clear()
    term.clear()
    term.setCursorPos(1,1)
    end

    clear()
    print("Aperture Calc")
    print("Copright (C) 1970 Aperture Labs")
    print("")
print("")
    write"Number 1: "
    num1 = tonumber(read())
    clear()
    write"Number 2: "
    num2 = tonumber(read())
    clear()
    write"Action: "
    act = read()

    if act == "+" then
    ans = num1 + num2
    elseif act == "-" then
    ans = num1 - num2
    elseif act == "*" then
    ans = num1 * num2
    elseif act == "/" then
    ans = num1 / num2
    end
    clear()
    write(num1.." "..act.." "..num2.." = "..ans)
    print("")
    print("Press any key to exit")
    os.pullEvent("key")