I looked through the Phobos page, but haven't found anything like it. Is there a sort of delay function anywhere in Phobos?

Brendan Wrote:

> I looked through the Phobos page, but haven't found anything like it. Is there a sort of delay function anywhere in Phobos?

Well, I just used 'sleep' from the Linux shell instead. I don't understand yet what I'm doing wrong with the following function, though. Could someone explain and advise?


void scrollString( char[] s ) {
    for ( int i = 0; i < s.length; i++ )
      writef( s[i] );
      system( "sleep 0.2" );
  }

On Tue, Sep 2, 2008 at 7:11 AM, Brendan <brenzie@gmail.com> wrote:

> Brendan Wrote:
>
> > I looked through the Phobos page, but haven't found anything like it. Is
> there a sort of delay function anywhere in Phobos?
>
> Well, I just used 'sleep' from the Linux shell instead. I don't understand yet what I'm doing wrong with the following function, though. Could someone explain and advise?
>
>
> void scrollString( char[] s ) {
>    for ( int i = 0; i < s.length; i++ )
>      writef( s[i] );
>      system( "sleep 0.2" );
>  }
>
>
If you're expecting it to pause after each character.. you're missing braces around the body of the for loop, this isn't Python ;)

Reply to Brendan,

> Brendan Wrote:
> 
>> I looked through the Phobos page, but haven't found anything like it.
>> Is there a sort of delay function anywhere in Phobos?
>> 
> Well, I just used 'sleep' from the Linux shell instead. I don't
> understand yet what I'm doing wrong with the following function,
> though. Could someone explain and advise?
> 
> void scrollString( char[] s ) {
> for ( int i = 0; i < s.length; i++ )
> writef( s[i] );
> system( "sleep 0.2" );
> }

IIRC the are the standard sleep and usleep functions in std.c.something

Jarrett Billingsley Wrote:


> </blockquote></div><br>If you're expecting it to pause after each character.. you're missing braces around the body of the for loop, this isn't Python ;)<br></div>
> 

Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing it out.

But the result isn't fruitful, though. When I run it, all I get is an empty screen, then after many seconds the whole string is displayed at once (not to mention I set the sleep time to 0.1 seconds). I'm probably missing something. Any idea?

Brendan wrote:
> Jarrett Billingsley Wrote:
> 
> 
>> </blockquote></div><br>If you're expecting it to pause after each character.. you're missing braces around the body of the for loop, this isn't Python ;)<br></div>
>>
> 
> Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing it out.
> 
> But the result isn't fruitful, though. When I run it, all I get is an empty screen, then after many seconds the whole string is displayed at once (not to mention I set the sleep time to 0.1 seconds). I'm probably missing something. Any idea?

Flush the output?

On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller < lordSaurontheGreat@gmail.com> wrote:

> Brendan wrote:
> > Jarrett Billingsley Wrote:
> >
> >
> >> </blockquote></div><br>If you're expecting it to pause after each
> character.. you're missing braces around the body of the for loop, this isn't Python ;)<br></div>
> >>
> >
> > Oooooh, what a foolish mistake! How could I forget that? Thanks for
> pointing it out.
> >
> > But the result isn't fruitful, though. When I run it, all I get is an
> empty screen, then after many seconds the whole string is displayed at once (not to mention I set the sleep time to 0.1 seconds). I'm probably missing something. Any idea?
>
> Flush the output?
>
>
Totally.

foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }

Brendan:
> Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing it out.

It's a mistake, but in the past years I have seen several similar mistakes in real programs written in C-like languages. That's why I'm a fan of semantically significant indentations :-) (Or of a built-in lint-like capability of the language that signals such indentation errors are syntax errors).

Bye,
bearophile

"bearophile" wrote
> Brendan:
>> Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing it out.
>
> It's a mistake, but in the past years I have seen several similar mistakes in real programs written in C-like languages. That's why I'm a fan of semantically significant indentations :-) (Or of a built-in lint-like capability of the language that signals such indentation errors are syntax errors).

Any reasonable syntax highlighting editor should show you that you forgot something.

In vim, if I forget something like this, the second statement's indent jumps back to the same level as the if statement, signalling that I forgot to add the curly brace.

-Steve

Jarrett Billingsley Wrote:

> On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller < lordSaurontheGreat@gmail.com> wrote:
> 
> > Brendan wrote:
> > > Jarrett Billingsley Wrote:
> > >
> > >
> > >> </blockquote></div><br>If you're expecting it to pause after each
> > character.. you're missing braces around the body of the for loop, this isn't Python ;)<br></div>
> > >>
> > >
> > > Oooooh, what a foolish mistake! How could I forget that? Thanks for
> > pointing it out.
> > >
> > > But the result isn't fruitful, though. When I run it, all I get is an
> > empty screen, then after many seconds the whole string is displayed at once (not to mention I set the sleep time to 0.1 seconds). I'm probably missing something. Any idea?
> >
> > Flush the output?
> >
> >
> Totally.
> 
> foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }

Thanks! With a little quick tweaking it worked. But, even though I see the effective result, I don't entirely understand what it means "to flush" the output. I've never heard of this concept before and Google doesn't seem to return any useful answers. Could you explain?