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Haskell Parse Error On Input Module

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I've tried removing the if-then-else portion since my prof told us it was optional and using (graph Char Int) instead of graph as a parameter, but neither worked. Browse other questions tagged haskell or ask your own question. What exact message are you getting?Code: Select allps2.hs:9:16: parse error on input `empty'
EDIT: I counted the lines, and line 16 isn't the definition of the empty function, it's this:Code: Select I think I'm going to leave the v and e data types generalized though, because that was part of the original template and I think my prof wants it to be

Haskell Parse Error On Input Module

Top stone915 Posts: 42 Joined: Wed Jan 07, 2009 4:31 am UTC Re: Haskell - "Parse error on input" Quote Postby stone915 » Mon Jan 26, 2009 4:58 am UTC Awesome, Found an article about the different types of folds if anyone else is interested.http://haskell.org/haskellwiki/Foldr_Foldl_Foldl' Top stone915 Posts: 42 Joined: Wed Jan 07, 2009 4:31 am UTC Re: Haskell - "Parse error Using shrinkage when estimating covariance matrix before doing PCA Why isn't Almond Milk (and other non-animal based 'milk') considered juice?

  1. Also, you don't import the module you're currently in: module sayhello ( inChinese , inSpanish ) where inChinese = "Ni Hao" inSpanish = "Hola" main = do print inChinese print inSpanish
  2. When if is used for sequencing IO it is not uncommon to see an else that returns a null value: main = do startNetwork <- askUser "Network? " if startNetwork then
  3. let x = if b then y -- compare to x = b?
  4. In the first case each step of the computation is evaluating something to the effect of False || 'rest' where 'rest' is a tail recursive call to foldl'.

Alphabetize Integers Naming the forces of the Purgatory? Just out of curiosity, what is the difference between foldl' and foldl?Minor problem which you don't have to answer because you've already helped me out a lot: any idea on why Move 2 to 3. Haskell Let Can a rejected manuscript be submitted to another Elsevier journal?

Am I right to think this homework problem on counting triangles within a 4x4 grid is improperly set out? Parse Error On Input Haskell Why did Ponda Baba and Doctor Evazan in the cantina dislike Luke so much? Join them; it only takes a minute: Sign up Haskell: parse error on input `import' up vote 1 down vote favorite I am trying to recreate the output of this Haskell Main> putStr (hanoi_shower (hanoi 1 2 3 2)) Move 1 to 2.

That is, the position of the "else" in the following is a syntax error: do if boolean then expr1 else expr2 The following is correct: do if boolean then expr1 else Haskell Do This means the below signature is invalid: ghci> map floor [1,2,3,4] :: [Float] and should instead be: ghci> map floor ([1,2,3,4] :: [Float]) or alternatively put the type signature on one James Potter and the Cloak of Invisibility - Why didn't he use it to hide the family from Voldemort? Commuting daily with an Expensive Bike, tips?

Parse Error On Input Haskell

Another way of writing hanoi_shower, using map, is as follows: hanoi_shower :: Show a => [(a, a)] -> String hanoi_shower moves = unlines (map move moves) where move (a, b) = Not the answer you're looking for? Haskell Parse Error On Input Module Perhaps there is some problem with copying indented Any help appreciated, -- Skip Montanaro - skip at pobox.com - http://www.smontanaro.net/ Previous message: [Haskell-beginners] midi file stuff Next message: [Haskell-beginners] "module Main" Haskell Parse Error On Input Function karma elite dons lambdabotD0ns has a karma of 0 rhzon the line with foreign import ccall safe ..

um.. this content current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed It would appear there is some sort of problem with the dirAndSize definition above that, but if that was the case why didn't I get a parse error when removing the Parse Error (possibly Incorrect Indentation Or Mismatched Brackets)

up vote 0 down vote favorite I've just took up haskell and alex/happy because I wanted to write a parser. Browse other questions tagged haskell or ask your own question. GHCi reports version 6.12.3. http://newmicros.net/parse-error/haskell-parse-error-on-input.html What exact message are you getting?

boost 100ns pulse from 5 v to 10 v Naming the forces of the Purgatory? Variable Not In Scope Haskell What some miss is that then and else, if used within a section of code where indentation matters, must be indented deeper than the if statement. y What is x when b is false?

Move your definition of strip to the footer instead. –Daniel Wagner Oct 7 '13 at 10:18 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote As

As I was typing that, I realized I forgot to add a comma after insertVertex when I commented out the other functions I need to implement. One example that recently (in April, 2008) appeared on the Haskell-Cafe mailing list (see the reply post Re: Embedding newlines into a string?) was the following. Takagi looked like? Haskell Module I'd prefer minimal help, such as an explanation of the error message or a syntax correction rather than a step by step solution, as this is for a class and I'm

Here is the result of executing the above code in WinHugs: Main> putStr (hanoi_shower (hanoi 'a' 'b' 'c' 2)) Move 'a' to 'b'. Russell.) 2 See also What a Monad is not Retrieved from "https://wiki.haskell.org/index.php?title=Common_Misunderstandings&oldid=60549" Category: FAQ Navigation Haskell Wiki community Recent changes Random page Tools What links here Related changes Special pages Printable that sucks rhzSamB: What do you mean? check over here However, I ran into this problem: source: lexer.x { module ValkenLexer where strip :: String -> String strip s = take ((length s) - 2) (drop 1 s) } %wrapper "basic"

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed How can I count Document library in Sites(SPWeb) Level? Notice how this makes no sense without z. deleting billions of files from directory while seeing the progress as well boost 100ns pulse from 5 v to 10 v Package for the Closest Vector Problem (CVP)?

It might be best not to think of if-then-else as flow control, as in most imperative languages, but think of it as construction of a value using a well formed expression. Re: Haskell - "Parse error on input" Quote Postby Qoppa » Mon Jan 26, 2009 5:36 am UTC line:character#, not the other way around.