Sounds like two questions wrapped into one. When it comes to setting names to values, Scheme programming encourages the use of a "let" expression to bind values to names inside of a (usually narrow) scope rather than assigning a value to a variable. See more here: https://docs.racket-lang.org/guide/let.html
As for the typed random value, the Flonum from (random) should be fine since a Flonum is also a Real. Can you provide a short example of runnable code that exposes the problem you're having? On Wed, Jul 5, 2017, at 08:39 PM, Alasdair McAndrew wrote: > I'm doing a little programming which requires the use of some random > numbers. Basically I add a random value at one stage, and subtract it a > bit later. Something like this pseudo-code (where "x" is an existing > variable): > > set rand_value <- (random) > set new_value <- x + rand_value > > ... do stuff ... > > set new_value <- new_value - rand_value > > All values may be considered Reals. I tried to do this in Typed Racket, > where x was of type "Real" and got errors about mismatched types: > "(random)" produces a "flonum". I was also using "set!" for the > assignment of the random value, which I understand to be poor practice: > how would I do something like the above in a more "rackety" manner? > Thank you! > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
