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Parse Error On Input If Haskell


Carrying Metal gifts to USA (elephant, eagle & peacock) for my friends Why do units (from physics) behave like numbers? Different programs have different ideas about what a tab character should mean: a fixed number of spaces (and if so how many?) or enough space to reach the next "tab stop" 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 Do these physical parameters seem plausible? "Have permission" vs "have a permission" Does "when ~ dies, deal n damage to all players/creatures" have a name? "Surprising" examples of Markov chains What Source

Indentation?0haskell parse error on input '<-'0Parse Error on input 'appendString' Haskell0Haskell Parse Error inside do block0Haskell “parse error on input ‘=’”4Indentation-aware parsing of expression trees Hot Network Questions How to explain I am designing a new exoplanet. How would I simplify this summation: Notation for lengths Is this alternate history plausible? (Hard Sci-Fi, Realistic History) Interpolation of magnitude of discrete Fourier transform (DFT) Find the super palindromes! I did replace the concatenation with (:) for efficiency. http://stackoverflow.com/questions/23463132/haskell-parse-error-on-input-if

Parse Error On Input Haskell

comment:3 Changed 16 months ago by thomie Cc MikeIzbicki added Milestone set to 7.10.3 @MikeIzbicki: as the author of ​Phab:D201, could you have a look? Used spaces instead of tabs and it worked. 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'. Have you - by any chance - mixed tabs and spaces?

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 This way. 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 5:24 am UTC Berengal Top dosboot Posts: 143 Joined: Sun Jul 01, 2007 5:26 am UTC Re: Haskell - "Parse error on input" Quote Postby dosboot » Mon Jan 26, 2009 3:52 am UTC v

So the edge ('a','b',1) means that when given the input 1, move from state 'a' to state 'b'. permalinkembedsaveparentgive gold[–]quchen 3 points4 points5 points 2 years ago(0 children)Just to clarify what you said a bit more, a \t is not necessarily eight spaces, only a tabstop is. Your answer is really helpful. You need to provide an value, if you're coming from Python, then think about something like a = "dogs" if 1 < 0 else "cats" here, you need to provide the

Move 1 to 3. up vote 4 down vote favorite I have the following code and I already tried multiple ways to write this, but I can't make it work. Similarly, in Haskell an if/then makes no sense without an else. From the Haskell 2010 Report, section "Layout": Tab stops are 8 characters apart.

Haskell If Then Else

permalinkembedsaveparentgive gold[–]zeltol[S] 3 points4 points5 points 2 years ago*(4 children)Thanks! this y What is x when b is false? Parse Error On Input Haskell Line 9, character 16 is the beginning of the declaration of empty in the module interface. Haskell Let Please click the link in the confirmation email to activate your subscription.

permalinkembedsaveparentgive gold[–]yitz 1 point2 points3 points 2 years ago(1 child)From experience, tabs are a recipe for disaster. http://kiloubox.com/parse-error/parse-error-haskell.html However, I do appreciate the recommendations. Why does a full moon seem uniformly bright from earth, shouldn't it be dimmer at the "border"? and the two don't line up at all causing a parse error.

permalinkembedsaveparentgive gold[–]bss03 5 points6 points7 points 2 years ago(1 child)Not just GHC. Move 'b' to 'c'. permalinkembedsavegive gold[–]zeltol[S] 0 points1 point2 points 2 years ago(4 children)Can you please explain why tabs and spaces make a difference? have a peek here GHC 7.0.1 and later). 1.2 If / Then / Else if-then statements must always include an 'else' portion.

Should I boost his character level to match the rest of the group? Sound and Fury News & Articles Serious Business XKCD Meetups General Numberologics, Alchemy, Linguinomics, and other Academiology Mathematics Science Fictional Science Language/Linguistics An example of how this might cause trouble is as follows: Although the two lines wherebmi = ... skinny = ...

Absolutely fine, IMO.

I'm working on the second part of the assignment. I have tried many different configurations of the if-then-else statement to no avail. Things looked aligned in my editor (but then when I cut and paste here .. Move 'a' to 'c'.

I really did not notice this when I write it. something ... } | 'if' exp optSemi 'then' error {% ... How to do \widthof with a symbol Teaching a blind student MATLAB programming Why can't I set a property to undefined? http://kiloubox.com/parse-error/parse-error-on-input-import-haskell.html I'm currently trying to write a function (stepDFA) that, when given an automaton, a state name, and an input symbol, will return the state reachable from the given state by using

It might help a little bit if you better explained what you are trying to do, or what you expect to be happening with the code you wrote. 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 4:18 am UTC dosboot Haskell Hot Network Questions sort command : -g versus -n flag Asking for a written form filled in ALL CAPS Why don't cameras offer more than 3 colour channels? (Or do The question is about where rather than do, but the general principle is the same, and the answers there cover it well.

then \case -> else ..." causes a "missing else clause" error Reported by: dramforever Owned by: Priority: normal Milestone: 7.10.3 Component: Compiler (Parser) Version: 7.10.1 Keywords: Cc: MikeIzbicki Operating System: Unknown/Multiple Output the Hebrew alphabet Glossy material rendering black, in a scene with environment and emission lighting Does "when ~ dies, deal n damage to all players/creatures" have a name? One should also recognize that the types returned by the then and else branches must match due to Haskell's strong and static type system. Here, the error message doesn't help to recognize the problem. (Entry added by Benjamin L.

Some error messages got much worse however (see tests), and the result seems to be a net negative. I don't think I'm going to use too many of your modifications, partly because it involves code we haven't covered in class yet and partly because I'd rather turn in code makes sense up until the =, that's where the parse error happens. Extreme Value Theorem on Manifold N(e(s(t))) a string Should I use "teamo" or "skipo"?

I tried adding the else sentence, but I get the same. Try this in ghci Code: Select allPrelude> let ff = take 1000000 (repeat False)
Prelude> import Data.List Why is AT&T's stock price declining, during the days that they announced the acquisition of Time Warner inc.? 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

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. DDoS ignorant newbie question: Why not block originating IP addresses? All of the statements in a do block must start with the exact same whitespace, and not just appear to line up visually. The graph will contain a list of ordered pairs made up of a vertex and a list of vertices connected to that vertex (an adjacency list).

sgetLine = do x <- getChar if x == '\n' then do putChar x return [] else do putChar '_' xs <- sgetLine return (x:xs) The lines in within a do permalinkembedsaveparentgive gold[–]eigenduck 1 point2 points3 points 2 years ago(0 children)The layout rules mean that it matters how far a line is indented.