Do pay attention to Vcat? and VCham? On Jun 29, 2012, at 4:12 PM, Roelof Wobben wrote:
> I know. > As I understand it Vanimal is the world which can exist of a Vcat or a Vcham. > The problem is that I cannot know which one it is and if don't do a > define-struct Vanimal () I cannot check if the make the right world. > I will reread the chapter how to solve this. > > Roelof > > > > Op 29-6-2012 21:47, Matthias Felleisen schreef: >> On Jun 29, 2012, at 3:14 PM, Roelof Wobben wrote: >> >>> ; Te gebruiken structs >>> >>> ; Design a world program that works with both cats and chameleons: >>> ; A VAnimal is either >>> ; – a VCat >>> ; – a VCham >>> (define-struct Vanimal (Vchat Vcham)) >> >> Please re-read the chapter. The above is completely wrong. >> >> EITHER a VAnimal is one of two things >> OR it is a combination of two things. >> >> You can't have it both ways. -- Matthias >> >> > > ____________________ Racket Users list: http://lists.racket-lang.org/users
