On Thu, Jun 08, 2017 at 04:03:55PM +0300, Mahmoud Murad wrote:
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