nREPL server started on port 53667 on host 127.0.0.1
REPL-y 0.3.0
Clojure 1.5.1
Docs: (doc function-name-here)
(find-doc "part-of-name-here")
Source: (source function-name-here)
Javadoc: (javadoc java-object-or-class-here)
Exit: Control+D or (exit) or (quit)
Results: Stored in vars *1, *2, *3, an exception in *e
*user=> (source println)*
(defn println
"Same as print followed by (newline)"
{:added "1.0"
:static true}
[& more]
(binding [*print-readably* nil]
(apply prn more)))
nil
*user=> (source prn)*
(defn prn
"Same as pr followed by (newline). Observes *flush-on-newline*"
{:added "1.0"
:static true}
[& more]
(apply pr more)
(newline)
(when *flush-on-newline*
(flush)))
nil
*user=> (source printf)*
(defn printf
"Prints formatted output, as per format"
{:added "1.0"
:static true}
[fmt & args]
(print (apply format fmt args)))
nil
*user=> (source print)*
(defn print
"Prints the object(s) to the output stream that is the current value
of *out*. print and println produce output for human consumption."
{:added "1.0"
:static true}
[& more]
(binding [*print-readably* nil]
(apply pr more)))
nil
*user=> (source pr)*
(defn pr
"Prints the object(s) to the output stream that is the current value
of *out*. Prints the object(s), separated by spaces if there is
more than one. By default, pr and prn print in a way that objects
can be read by the reader"
{:dynamic true
:added "1.0"}
([] nil)
([x]
(pr-on x *out*))
([x & more]
(pr x)
(. *out* (append \space))
(if-let [nmore (next more)]
(recur (first more) nmore)
(apply pr more))))
nil
*user=> *flush-on-newline**
true
user=>
On Thu, Apr 10, 2014 at 1:50 PM, Cecil Westerhof <[email protected]>wrote:
> 2014-04-10 13:40 GMT+02:00 Di Xu <[email protected]>:
>
> 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 <[email protected]>:
>>
>>> 2014-04-10 12:52 GMT+02:00 Kevin Ilchmann Jørgensen <[email protected]>:
>>>
>>> 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 <
>>>> [email protected]> 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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