On Nov 29, 2011, at 6:55 PM, Bloch Stephen wrote: > > On Nov 29, 2011, at 4:31 PM, David Van Horn wrote: > >> On 11/29/11 4:28 PM, Jakub Hadam wrote: >>> Hello, >>> I claim there is a typo in the online version of HtDP: >>> Exercise 4.3.3, the first condition should be >>> >>> [(<= n 1000) (* .040 n)] >>> >>> >>> >>> instead of >>> >>> [(<= n 1000) (* .040 1000)] >> >> Why? That's what's in the printed book too and it seems perfectly >> reasonable to me. > > Well, it's a "what is the value of this expression?" exercise, so technically > it could have been anything. However, to solve the intended problem of bank > interest, Jakub is right: it should be (* .040 n) in the first case > (otherwise people would earn the same $40 interest on a deposit of a penny as > on a deposit of $1000.) >
The exercise is intentionally formulated this way. I am glad you discovered the twist. -- Matthias _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
