Bernie wrote:
>
> The key here is that you write "a keyboard input of "9999" as the "stop
> program" command". So the way to solve this is easy just don't enter that
> into the computer (and why not ask the computer for the date?).
> More to the point: (19)990909 doesn't contain four 9:s (9999) in a row
> (imagine if we only had 9 months a year and 9 days in each of them!)
That's usability. Run MS-DOS date, enter 9-9-99 (not 09-09-1999) it will
work. Entering 9999 is a valid date in many programms. Especially while
there is no way of interpreting it in any other way.
Also, 9999 as a stop is not always manually entered but read from
memory.
Big computers often set their clock to external clocks (eg atomic
clocks).
Fake an date input signal to 9999 and the computer would stop, eg
because
the software-test ended.
--
Casper Gielen
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