interpreter tweaks mhe authored 1 hour ago afad15cf Overview.md 1.77 KB Implementing a small imperative language We implement an interpreter for a small imperative programming language. Example This is the sample file fibonacci.xy: { y := 0; z := 1; while (x > 0) { x := x – 1; t := y + z; […]
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# Problem Sheet for Week 2 ## Polymorphism 1. (Requires Section [Polymorphism](../LectureNotes/Sections/polymorphism.md)) Find out the types of the following functions. Decide if they are polymorphic. 1. `fst` 2. `(++)` 3. `not` 4. `head` 5. `tail` 6. `id` 2. Explain, in your own words, what the function `zip` does. In the expression `zip [‘x’, ‘y’] [False]`,
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— Hangman example from chapter 10 of Programming in Haskell, — , Cambridge University Press, 2016. import System.IO hangman :: IO () hangman = do putStrLn “Think of a word:” word
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add more handouts and update index mhe authored 1 month ago 7845144f Runxy.md 2.18 KB Runxy This command line interface allows to run e.g. $ runhaskell Runxy.hs factorial.xy 5 120 for the file factorial.xy. The usage is runhaskell Runxy.hs Alternatively, for faster execution time, you can compile $ ghc –make Runxy.hs and then run it
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— Compiler example from chapter 17 of Programming in Haskell, — , Cambridge University Press, 2016. data Expr = Val Int | Add Expr Expr eval :: Expr -> Int eval (Val n) = n eval (Add x y) = eval x + eval y type Stack = [Int] data Code = HALT | PUSH
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# Monads ## Organization 1. We first discuss how to *use* existing monads. 1. We then explain what monads are, how they work, and how to define new ones. 1. Finally we discuss the parsing monad. Deliberately, this is a self-learning section, and so there are no video recordings for this section of the notes
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# Polymorphism ## Introduction Some functions act on elements of different types, independently of the precise shape of the elements. This is known as **polymorphism**. The topic is introduced in the (https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=68f0b311-947c-40b0-9dc4-adab008c597d) on Canvas. ## Example: the type family of lists Let’s look at the datatype of lists. We have seen in Section 3.3 of
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— Countdown example from chapter 9 of Programming in Haskell, — , Cambridge University Press, 2016. — — ** Interactive version for performance testing ** import System.IO import System.CPUTime import Numeric — Arithmetic operators data Op = Add | Sub | Mul | Div instance Show Op where show Add = “+” show Sub =
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# More on type classes and instances In this section, we study in detail two important type classes: 1. The type class `Ord` for ordered types. 2. The type class `Num` for numeric types. We also study an example of an *instance declaration with constraints*: `instance Ord a => Ord [a]`. This instance tells us
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— Caeser cipher example from chapter 8 of Programming in Haskell, — , Cambridge University Press, 2016. — Propositions data Prop = | Var Char | Not Prop | And Prop Prop | Imply Prop Prop p1 :: Prop p1 = And (Var ‘A’) (Not (Var ‘A’)) p2 :: Prop p2 = Imply (And (Var
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