Circle Calculator Help

[Steven Schveighoffer]

On Tue, 26 Jun 2012 10:40:18 -0400, Alexander  
<alexander at alexandermohn.com> wrote:

> Hello everybody!
>
> I am new to D, and I am working on a program that calculates the area  
> and circumference of a circle. However, when I compile it and run it, it  
> waits for the user to input the radius, but then it closes while  
> displaying a bunch of stuff.

I'm assuming you are running on Windows.  Windows with console output will  
allocate a console, and destroy the console after the program is finished.

If you want it to keep the console up, start the command line interpreter  
(cmd.exe) before-hand and then run the program from within the console.  
Then all the output stays put.


> //Wait
> void wait()
> {
> 	writefln ("Type A to continue!");
> 	exittest();
> }
>
> //Exit tester
> void exittest()
> {
> 	char[] a;
> 	stdin.readln(a);
> 	if (a == "A")
> 	{
> 		exit();
> 	}
> 	else
> 	{
> 		wait();
> 	}
> }

Hm... interesting code here :)

This is not horrible, just... weird.

You probably want to avoid recursion in this case:

void wait()
{
    char[] a;
    while(a != "A")
    {
        writeln("Type A to continue!");
        stdin.readln(a);
    }
}

-Steve