[erlang-questions] Formatting integers with io_lib

Mazen Harake <>
Thu Oct 28 09:39:29 CEST 2010


Relevant documentation:
http://www.erlang.org/doc/man/io.html#format-2

On 27/10/2010 21:41, Ulf Wiger wrote:
> 1>  {H,M,S} = time().
> {21,37,1}
> 2>  io:fwrite("~2.2.0w.~2.2.0w.~2.2.0w~n",[H,M,S]).
> 21.37.01
>
> BR,
> Ulf W
>
> On 27 Oct 2010, at 21:32, Bryan Robinson [ICG-MKTS] wrote:
>
>> I may have missed or misunderstood something in the io_lib and io
>> library documentation, but is there a way to use io_lib:format() to
>> insert leading zero characters on small integers?  For example, in the
>> Erlang shell:
>>
>> {_,Time} = calendar:local_time().
>> {H,M,S} = Time.
>> Msg = io_lib:format("~w:~w:~w", [H,M,S]").
>> io_format("~s", Msg).
>>
>> I get "15:2:9".  I would like to get back "15:02:09", and of course when
>> the integer is two digits I would not like the leading zero.
>>
>> Is there a similar way to do this like with the C stdlib and the %0n
>> where n=2 formatter?
>>
>> printf("%02d:%02d:%02d", h, m, t);
>>
>> I would appreciate any pointers or tips.  Thank you!
>>
>> -- 
>>
>> - Bryan
>>
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> Ulf Wiger, CTO, Erlang Solutions, Ltd.
> http://erlang-solutions.com
>
>
>
>
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