Read integer from console and sleep

[Ali Çehreli]

On 05/04/2012 10:51 AM, Iain wrote:
>>
>> If you want Iain I'll put this version by Ali Çehreli in Rosettacode:
>>
>> import std.stdio, core.thread;
>>
>> void main() {
>> write("Enter a time to sleep (in seconds): ");
>>
>> long secs;
>> readf(" %d", &secs);
>>
>> writeln("Sleeping...");
>> Thread.sleep(dur!"seconds"(secs));
>> writeln("Awake!");
>> }
>>
>>
>> Bye,
>> bearophile
>
> That's great, and thanks to Ali for explaining.
>
> Out of interest, is there a coordinated effort to update things like
> Rosetta or the dsource.org tutorials to use D2.0? I find one of the big
> stumbling blocks to learning is that half of the tutorials and code
> snippets out there are obsolete!
>

As far as I know, people maintain sites individually.

It is unfortunate but not surprising that many sites have been outdated 
considering the amount of changes to D in the recent years. I had to 
rewrite a number of chapters and go over many examples since I have 
started the original book a number of years ago. (See my shiny new 
signature. ;))

Somewhat off-topic, I have just hit a broken example today when 
translating the "null and is" chapter. This used to print 0:

     writeln(null);

but now causes an obscure compilation error:

.../dmd/phobos/std/stdio.d(1562): Error: undefined identifier 'length'
.../dmd/phobos/std/stdio.d(1562): Error: undefined identifier 'ptr', did 
you mean 'template tr(C1,C2,C3,C4 = immutable(char))'?
deneme.d(76953): Error: template instance 
std.stdio.writeln!(typeof(null)) error instantiating

It takes the 'null' value to be a "Specialization for strings - a very 
frequent case".

This is a bug, right? But what should printing 'null' do anyway? Print 0 
as before, or "null"?

Ali

-- 
D Programming Language Tutorial: http://ddili.org/ders/d.en/index.html