How would you solve this 'interview' question in D?

[monarch_dodra]

On Wednesday, 26 June 2013 at 21:00:42 UTC, Adam D. Ruppe wrote:
> On Wednesday, 26 June 2013 at 20:51:35 UTC, Gary Willoughby 
> wrote:
>> Just for a bit of fun, I saw this question posted on reddit 
>> the other day and wondered how *you* would solve this in D?
>
> Since they didn't say *pure* function, I'd cheat:
>
> int f(int n) {
>   static bool isOddCall;
>   isOddCall = !isOddCall;
>   if(!isOddCall)
>       return -n;
>   return n;
> }
>
> :P

Well if you solved it *that* way, *I* wouldn't hire you :p