> My understanding of Scheme, including Racket, is that types get converted > automatically without explicit casting. This is not an add-on for the > language, but is inherent in the language. For example: > (/ 10 6) > 5/3 this is what Gambit does > (/ 10 6) > 1 2/3 this is what Racket does > (/ 10 6) > 1.66667 this is what SICP says will happen (pg 5) > > Here we have integer data types as inputs, and either a rational or a float > as output. This is what I mean by dynamic-OOP, and what I think is > inappropriate for a numerical program such as yours. It is pretty convenient > for scripting, in which case the user just thinks "number" without > distinction between integers, rationals or floats --- most casual > programmers don't consider such distinctions to be important, as high-school > algebra class never made any such distinction. These are important > distinctions for numerical programmers however.
In addition to: > (/ 10 6) 1 2/3 > 10/6 1 2/3 See also: > (/ 10.0 6.0) 1.6666666666666667 > (exact->inexact 10/6) 1.6666666666666667 > #i1 1.0 > #i10/6 1.6666666666666667 And so on. Also see racket/flonum ____________________ Racket Users list: http://lists.racket-lang.org/users
