The program only wants to run once . . .

[Kernelpanic]

Could you give a bit more of an explanation of what goes wrong? The screenshot looks like it shows two functional runs of the program and neither of them hit the "Unbekannt" case.

When I reloaded and started the program, it worked, despite the old exe file. When I started it again, see screenshot.
At first it wasn't saved, but I also deleted the "untitled.exe". It is normally that the exe-file is saved in the same directory as the source file.
I am now sure that I have had this problem before.