编程代写 module AST where
module AST where import Interface Copyright By PowCoder代写 加微信 powcoder data Datum =Number Integer |Boolean Bool |Symbol String |Cons Datum Datum deriving (Show) instance SchemeData Datum where symbol= Symbol number=Number boolean=Boolean proper []=Nil proper (d:ds)= Cons d (proper ds) improper [] d=d improper (d’:ds) d= Cons d’ (improper ds d) 程序代写 CS代考 加微信: powcoder QQ: […]
编程代写 module AST where Read More »