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 [email protected]. > 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
