I can't Hello World!

[Rainer Schuetze via Digitalmars-d-ide]

On 07.03.2017 02:25, Better World wrote:
> On Sunday, 5 March 2017 at 19:57:56 UTC, Rainer Schuetze wrote:
>>
>> I suspect you started from a Windows Application template. You should
>> then switch the "Subsystem" to "Console" (on the "General" page of the
>> project configuration settings).
>
> Thank you. that worked. I appreciate a little explanation of why it
> didn't work and now works.

With subsystem "Windows", you tell the OS that your application will 
have a graphic UI with the usual windows. The OS will not create the 
console window in that case and the appropriate file handles will be 
invalid. Switching to subsystem "Console" will restore that behavior.