Thanks Francesco, I will try it
8 Haz 2017 16:55 tarihinde "Francesco Ariis"
I have the following problem, I want to randomly generate arithmetic expressions based on a number, for example: if I have n = 3, then the expression must have 3 operators like this (4)*(((3+5)-2)).
Hello Mahmoud, probably not the most flexible and posh solution, but datatypes would do. data Exp = EInt Integer | Sum Exp Exp | Diff Exp Exp | Mult Exp Exp and then of course you want to write evaluate :: Exp -> Integer and write :: Exp -> String -- maybe instance Show Exp where Once you do that, picking Exp constructors at random should not be difficult. There are other ways to write a DSL like this (using GADTs, tagless final style, etc.), each of those expands on/solves a specific problem (extensibility, etc.); but there is no benefit in complicating your code if you don't need it. Does that help? -F _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.