This simple program seems to just hang. I am probably missing something. Any help is appreciated. I am using Linux with DMD. Program compiles fine, but when enter a string & press enter, the programs seems to wait forever without returning.


import std.stdio;

void main()
{
	
	string firstName;
	readf("	%s\n", &firstName);
	writeln(firstName);
	
}


Thankyou
Venkat

On 02/07/2015 04:29 PM, Venkat Akkineni wrote:> This simple program seems to just hang. I am probably missing something.
> Any help is appreciated. I am using Linux with DMD. Program compiles
> fine, but when enter a string & press enter, the programs seems to wait
> forever without returning.
>
>
> import std.stdio;
>
> void main()
> {
>
>      string firstName;
>      readf("    %s\n", &firstName);

My earlier understanding was that readf was reading till the end of the input. So, you will see that it will terminate when you press Ctrl-D at the console. I explain that understanding here:

  http://ddili.org/ders/d.en/strings.html#ix_strings.readln

However, when I tried your code again with dmd git head, I see that readf reads the first line of entry *after* I press two Enters on the console.

Ali

On 02/07/2015 04:42 PM, Ali Çehreli wrote:

>  >      readf("    %s\n", &firstName);

> I see that readf reads the first line of entry *after* I press
> two Enters on the console.

OK, that is related to the '\n' character that you have in the format string. Also, repeating the space characters has no effect as a single space means "zero or more white space" anyway.

Ali

On Sunday, 8 February 2015 at 00:47:46 UTC, Ali Çehreli wrote:
> On 02/07/2015 04:42 PM, Ali Çehreli wrote:
>
> >  >      readf("    %s\n", &firstName);
>
> > I see that readf reads the first line of entry *after* I press
> > two Enters on the console.
>
> OK, that is related to the '\n' character that you have in the format string. Also, repeating the space characters has no effect as a single space means "zero or more white space" anyway.
>
> Ali

Thankyou, I think it was encoded to be some other character instead of a space. Once I removed the space and re-added it to the string, things seem to work.

I am reading your book. It is a great book for newbies. Thanks a lot for the effort.