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Parse Error Haskell


Privacy policy About HaskellWiki Disclaimers current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Also, the last line should be putStrLn $ "The num is:" ++ show (read number :: Int) So you have two options: main = do { putStrLn "Please enter the number"; My previous version is way how to write it in non lazy functional or logical languages in tail call fashion (e.g. What kind of bugs do "goto" statements lead to? Source

Additionally, you need more parenthesis (for pattern matching the list and for the argument to add). Carrying Metal gifts to USA (elephant, eagle & peacock) for my friends Bangalore to Tiruvannamalai : Even, asphalt road DDoS ignorant newbie question: Why not block originating IP addresses? Find the super palindromes! Until then, understand that a missing do from the top of a function or code block can result in your compiler giving an error message citing a much later line number. internet

Parse Error On Input =' Ghci

Join them; it only takes a minute: Sign up parse error on input `=' in Haskell up vote 2 down vote favorite 1 I wrote the following function in Haskell coordenadas Download Haskell Try Haskell in your browser Community Guidelines Other community locations: #haskell IRC channel Planet Haskell blog aggregator Follow Haskell on Twitter Haskell mailing lists NYC Haskell Meetup videos Professional permalinkembedsaveparentgive gold[–]faustianredditor 1 point2 points3 points 2 years ago(4 children)I usually use tabstops. Why is AT&T's stock price declining, during the days that they announced the acquisition of Time Warner inc.?

Notice how this makes no sense without z. permalinkembedsaveparentgive gold[–]dave4420 8 points9 points10 points 2 years ago(3 children)GHC uses standard eight character wide tab stops. Here is a corrected version of the code above: hanoi_shower :: Show a => [(a, a)] -> String hanoi_shower moves = unlines ["Move " ++ show a ++ " to "++ Haskell Parse Error On Input If Correct code: module Main where main = let x = 1 y = 2 z = 3 in putStrLn $ "X = " ++ show x ++ "\nY = " ++

Whatever column the first declaration starts in, the remaining declarations need to align to it. –Carl Jan 18 '14 at 5:18 1 That's the same rule for everything else that Why the brackets? –user905686 Aug 24 '11 at 15:58 1 @user905686 a:as can't be empty; if a:as is successfully matched, then there's at least one element in the list, and asked 5 years ago viewed 2846 times active 5 years ago Get the weekly newsletter! x = b?

Ty. –user905686 Aug 24 '11 at 18:45 add a comment| up vote 4 down vote The indentation error arises, because you need to indent the pattern guards in the where-clause at Parse Error On Input Arrow Upper bounds for regulators of real quadratic fields Can a nuclear detonation on Moon destroy life on Earth? How to do \widthof with a symbol What's the difference in sound between the letter η and the diphthong ει? This also means that this way probably avoids similar problems: coordinates :: String -> (Float, Float, Float) coordinates line = (x,y,z) where (_ : xStr : yStr : zStr : _)

Haskell Parse Error Possibly Incorrect Indentation

Your cache administrator is webmaster. http://stackoverflow.com/questions/21199840/parse-error-on-input-in-haskell permalinkembedsaveparentgive goldaboutblogaboutsource codeadvertisejobshelpsite rulesFAQwikireddiquettetransparencycontact usapps & toolsReddit for iPhoneReddit for Androidmobile websitebuttons<3reddit goldredditgiftsUse of this site constitutes acceptance of our User Agreement and Privacy Policy (updated). © 2016 reddit inc. Parse Error On Input =' Ghci Was the Boeing 747 designed to be supersonic? Haskell Parse Error On Input Let Not the answer you're looking for?

Do I need to do this? http://kiloubox.com/parse-error/parse-error-on-input-import-haskell.html asked 5 years ago viewed 28726 times active 8 days ago Get the weekly newsletter! I still write all my Haskell code with quite a few tabs, but you must respect the layout rules. more hot questions question feed lang-hs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Parse Error In Pattern Haskell

When you type directly into ghci, you need to type let at the start of the line: let f x = 2 * x share|improve this answer answered May 31 '11 A tab character causes the insertion of enough spaces to align the current position with the next tab stop. and the two don't line up at all causing a parse error. have a peek here What is the possible impact of dirtyc0w a.k.a. "dirty cow" bug?

I knew tabs were horrible but still used just because it never gave me an issue before. Parse Error On Input Case Can a nuclear detonation on Moon destroy life on Earth? Recent content is available under a simple permissive license.

Found this thread after googling, and this made my code work, plus it looks neater!

Anyway, there are even few options for vim. Since there is no operator in Haskell to append a single element to the end of a list, you'll have to use the list concatenation operator (++) :: [a] -> [a] Hot Network Questions Does "when ~ dies, deal n damage to all players/creatures" have a name? Haskell Parse Error On Input Module Notice that since a and b in (a, b) are polymorphic types, they can range over both Chars and Ints.

Join them; it only takes a minute: Sign up Haskell error parse error on input `=' up vote 88 down vote favorite 12 I'm new to Haskell and after starting ghci At each recursive step, a list of type [(a, a)] (a list of pairs) is mapped against the parameter (a, b):moves of hanoi_shower. If you're using Tabs, change them to whitespaces. Check This Out Are there any historically significant examples?

One advantage of Haskell is that there are often many ways of performing the same action, including iterating over lists. 1.6 Guards (The following two tips on guards were contributed by Therefore, don't use tabs in Haskell. makes sense up until the =, that's where the parse error happens. Anyway, have fun!

N(e(s(t))) a string Fill in the Minesweeper clues Why do jet engines smoke? If you don't, this is a good point to start, because emacs is pretty awesome. You're also comparing the element a to the list [] in your guard. In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

Generated Sun, 23 Oct 2016 23:37:49 GMT by s_wx1196 (squid/3.5.20) pow1 b e | (e == 0) = 1 | otherwise = b * pow1 b (e-1) (user142019 already stated this solution, however I felt a explanation is needed to understand Money transfer scam Can an irreducible representation have a zero character? Python is my primary language so that's pretty much beaten into me already. :) –Chad Miller Jan 18 '14 at 4:44 6 In that case, the rule is simple: every

GHC does stops at 8, 16, 24, etc. Make sure the left hand sides of your "where" assignments are aligned. Did you maybe mean something like this: addNums key num = add [] key num where add res (a:as) (b:bs) | as == [] = res | otherwise = add (res permalinkembedsaveparentgive gold[–]yitz -1 points0 points1 point 2 years ago(0 children)It's pretty clear that the intention of "8 characters apart" is specifically starting at the beginning of the line.