Struct Union behavior

[Voitech via Digitalmars-d-learn]

On Wednesday, 6 January 2016 at 12:25:31 UTC, Nicholas Wilson 
wrote:
> Probably because you are accessing uninitialised memory. the 
> values 4,5,9 appear in the first unittest and are left on the 
> stack. Unions ,unlike structs, do not initialise their fields 
> because it does not make sense to do so because the memory 
> aliases. This can be observed by looking at the size of element 
> (16 bytes) which is less than the size of an array (on 64 bit 
> systems) , 2*8 bytes plus size of a real (8 or 10 bytes 
> (x86/64)).
>
> [...]

Thank you for your answer it was very helpful :)
Cheers.