If I run the following example program from the 'Programming in
D' book, the input doesn't 'get stuck' as stated in the book but
instead produces the error message given. Have things changed
since that part of the book was written or is it some other
issue? The version that uses " %s" in the call to readf works as
expected.


import std.stdio;

void main(){
	
	write("How many students are there? ");
	int studentCount;
	readf("%s", &studentCount);
	write("How many teachers are there? ");
	int teacherCount;
	readf("%s", &teacherCount);

	writeln("Got it: There are ", studentCount, " students",
	" and ", teacherCount, " teachers.");
}

How many students are there? 67
How many teachers are there? 5
std.conv.ConvException@/usr/include/dmd/phobos/std/conv.d(1968):
Unexpected '5' when converting from type LockingTextReader to
type int
...

On 01/30/2015 04:49 AM, Paul wrote:

> If I run the following example program from the 'Programming in
> D' book, the input doesn't 'get stuck' as stated in the book but
> instead produces the error message given. Have things changed
> since that part of the book was written or is it some other
> issue?

Apparently, things did change since then. I will change the text accordingly. I would like to add you to the acknowledgments section if you email your full name to acehreli@yahoo.com. Thank you...

> The version that uses " %s" in the call to readf works as
> expected.
>
>
> import std.stdio;
>
> void main(){
>
>      write("How many students are there? ");
>      int studentCount;
>      readf("%s", &studentCount);
>      write("How many teachers are there? ");
>      int teacherCount;
>      readf("%s", &teacherCount);
>
>      writeln("Got it: There are ", studentCount, " students",
>      " and ", teacherCount, " teachers.");
> }
>
> How many students are there? 67
> How many teachers are there? 5
> std.conv.ConvException@/usr/include/dmd/phobos/std/conv.d(1968):
> Unexpected '5' when converting from type LockingTextReader to
> type int
> ...

Not the best error message... Saying '5' is unexpected for 'int' is confusing, right? Unfortunately, I can't come up with a good explanation for that error message in the book. :)

Ali

On Friday, 30 January 2015 at 15:03:55 UTC, Ali Çehreli wrote:

> Not the best error message... Saying '5' is unexpected for 'int' is confusing, right? Unfortunately, I can't come up with a good explanation for that error message in the book. :)

Maybe just remove the section with the 'incorrect' syntax? The reader will have to take it as read that " %s" is the correct form  :D