Hello,


import std.stdio;
import std.math;
import std.conv;
import std.stream;
import std.c.stdio;

void main() {
        int r;

        while(1) {
                writef("Bitte geben Sie den Radius ein ");
                //flush(stdout); // ???
                r = toInt(std.stream.stdin.readLine());
                if (r == 0) {
                        break;
                }
                writefln("Die Kreisflaeche betraegt %f",PI * r * r);

        }
}

That is the output from the Programm:
hansen@manni-lx:~/dd$ ./abbruch
3
Bitte geben Sie den Radius ein Die Kreisflaeche betraegt 28.274334


You see the "Bitte geben Sie den Radius ein" comes after the readline function. I try to solve this with flush but without success.

Manfred

>                writef("Bitte geben Sie den Radius ein ");
>                //flush(stdout); // ???
>                r = toInt(std.stream.stdin.readLine());

Flushing should work but I'm surprised you don't have to qualify stdout since there are two stdouts: one in std.c.stdio and one in std.stream. You could also not import std.stdio and just use std.stream and replace "writef(...)" with "stdout.writef(...)".

hope that helps,
-Ben

Ben Hinkle wrote:

>>                writef("Bitte geben Sie den Radius ein ");
>>                //flush(stdout); // ???
>>                r = toInt(std.stream.stdin.readLine());
> 
> Flushing should work but I'm surprised you don't have to qualify stdout since there are two stdouts: one in std.c.stdio and one in std.stream. You could also not import std.stdio and just use std.stream and replace "writef(...)" with "stdout.writef(...)".
> 
> hope that helps,
Yes

Manfred

Manfred Hansen wrote:
> Ben Hinkle wrote:
> 
> 
>>>               writef("Bitte geben Sie den Radius ein ");
>>>               //flush(stdout); // ???
>>>               r = toInt(std.stream.stdin.readLine());
>>
>>Flushing should work but I'm surprised you don't have to qualify stdout
>>since there are two stdouts: one in std.c.stdio and one in std.stream. You

Could it be because stdout is a pre-opened file handle, and thus not package dependent?

I.e. flush(stdout) uses the file handle (of which there only should be one), while having to write "std.stream.stdin..." is a function in a specific package.