2014-04-10 13:40 GMT+02:00 Di Xu <xudi...@gmail.com>:

> there're three buffer mode in unix, line buffered, full buffered and no
> buffered, if the output is terminal then it's default to line buffered.
> That means it buffer the output until '\n' occurs, you can force output via
> flush.
>

The printf format string is "%s: %s\n", so there is a newline, but it is
not acted upon.



> 2014-04-10 19:30 GMT+08:00 Cecil Westerhof <cldwester...@gmail.com>:
>
>> 2014-04-10 12:52 GMT+02:00 Kevin Ilchmann Jørgensen <kijm...@gmail.com>:
>>
>> I believe this is how the terminal behave. You can force an
>>> (clojure.core/flush)
>>>
>>
>> But why does println not behave this way?
>>
>> I think I stick to println for the moment.
>>
>>
>> On Thu, Apr 10, 2014 at 12:34 PM, Cecil Westerhof <cldwester...@gmail.com
>>> > wrote:
>>>
>>>> I have the following simple program:
>>>>     (def time-format (new java.text.SimpleDateFormat "hh:mm:ss"))
>>>>
>>>>     (defn now []
>>>>       (new java.util.GregorianCalendar))
>>>>
>>>>     (defn give-message [message]
>>>>       (printf
>>>> 
>>>> "%s: %s\n" (. time-format format (. (now) getTime)) message))
>>>>
>>>>     (give-message "Start")
>>>>     (doseq [i (range 1 100000001)]
>>>>            (let [val (Math/sqrt i)
>>>>                 diff (Math/abs (- (Math/pow val 2) (* val val)))]
>>>>                 (when-not (< diff 1.5E-8)
>>>>                   (println (format "Different for %d (%e)" i diff)))))
>>>>     (give-message "Stop")
>>>>
>>>> It does what it should, but I have a little problem with it: the output
>>>> of give-message is only showed after terminating the program. Why is that?
>>>>
>>>> When changing give-message to:
>>>>     (defn give-message [message]
>>>>       (println (format "%s: %s" (. time-format format (. (now)
>>>> getTime)) message)))
>>>>
>>>> the output is shown immediately.
>>>>
>>>
-- 
Cecil Westerhof

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