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Parse Error In Pattern Putstrln

I'll add that to my answer as well. –bheklilr Jul 31 '14 at 13:17 @bheklilr There are some slight variations from place to place, though. Interpolation of magnitude of discrete Fourier transform (DFT) How do I "Install" Linux? Basically, if the list is empty, then stop. asked 2 years ago viewed 237 times active 2 years ago Related 3Haskell: Parsing error with 'where' and a guard3Haskell Relations Error - Syntax error in declaration (unexpected `;', possibly due Source

Since Haskell does care about the formatting, you are far less likely to see things differently than the compiler does.SummaryWell, I think I went over my time again, but there was I already knew about the bug. This works for me: numberMapper:: IO () numberMapper = do codes <- forM [1 .. 4] (\num -> do putStrLn $ "Enter a code for " ++ show num code <- else > statement. http://stackoverflow.com/questions/16880078/haskell-parse-error-on-input-putstrln

Not the answer you're looking for? So, we get the best of both worlds: we don't have to tell the compiler about our variables before we use them, but the compiler can still tell us if we GBiz is too! Latest News Stories: Recent Msgs:fedora-development/2016-10/msg02687.htmlfedora-announce/2016-10/msg02044.htmlgeneral/2016-10/msg29602.htmlubuntu-bugs/2016-10/msg11753.htmlcommits.gnome/2016-10/msg07113.htmlfedora-announce/2016-10/msg02098.htmlgeneral.incubator.apache.org/2016-10/msg00216.htmlfedora-announce/2016-10/msg02040.htmlfedora-announce/2016-10/msg02048.htmlgeneral/2016-10/msg29609.html Latest News Stories: Linux 4.0 Kernel Released Google Lets SMTP Certificate Expire Open Crypto Audit Passes TrueCrypt CIA 'tried to crack Thank you for sharing your knowledge, I'm really impressed with the quality of the lessons (learning fast and solid ;D)!Congratulations!

If not, you've been bitten by a somewhat less than obvious aspect of layout - although it's pretty clear with an explanation. how can that be done using sequence? –Rog Matthews Jan 16 '12 at 6:20 2 I think you're best off asking something unrelated like that as a separate question. –Tikhon Browse other questions tagged haskell or ask your own question. When you need to indent a line, press the TAB key a couple times in a row.

But it doesn't conform to the pattern productions, hence the parse error. > > My initial goal was to keep the minimum inside the if ... apt-get how to know what to install Does the code terminate? You should follow this convention as well, because the compiler expects it.do notationThe first new thing we see is the do keyword. How to explain the existence of just one religion?

So, when you write ... = do xxx if blah then do foo bar else baz zap the "do" after the then opens a new layout-block inside the big do-block, since Thank you very much. > But I still can't figure out what went wrong. Is it a Textmate-problem that it can't read from STDIN?Great lesson so far by the way! martijn:It sounds to me like it is indeed a problem with textmate not being able to read stdin.

Beginners take note of the way the lines that start with 'putStrLn', 'name' and 'putStrLn' again are indented in relation to the 'do' statement. click to read more 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 be cleanest to have realWork :: FileName -> IO () realWork file = do sacFile1 <- openBinaryFile file ReadMode ... sir my name is Abhimanyu Sharma.

I actually knew it wouldn't work since it is takes only argument from 0 to 15... this contact form Output the Hebrew alphabet Where's the 0xBEEF? If not, you've been bitten by a somewhat less than obvious aspect of layout - although it's pretty clear with an explanation. main :: IO () main = do argList <- getArgs case argList of [] -> putStrLn "No filename ..." (f:_) -> realWork f or if null argList then putStrLn "..." else

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 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"; Why does a full moon seem uniformly bright from earth, shouldn't it be dimmer at the "border"? http://kiloubox.com/parse-error/parse-error-in-pattern-putstr.html Buffer overflows occur when a string is too big to fit in the space allocated for it, or when some code thinks a string is longer than it really is, and

The indentation level thereof is determined by the 'f' of "foo", bar is indented to the same level as foo, so it's a new expression in that same block. I still don't understand exactly what lies behind, but start to get the picture. Basically, if the list is empty, then stop.

I will modify the code with the realWork function as you suggested.

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Buffer overflows are an extremely common source of security holes and program crashes. Basically, if the list is empty, then stop. But it doesn't conform to the pattern productions, hence the parse error. > > My initial goal was to keep the minimum inside the if ...

For example, in C, you would declare a variable i and assign it the value 9 like this: int i; i = 9;This called a destructive update and is different than Basically, if the list is empty, then stop. The indentation level thereof > is determined by the 'f' of "foo", bar is indented to the same level as > foo, so it's a new expression in that same block. Check This Out Thank you very much.

Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 12 Star 80 Fork 40 haskell-suite/haskell-src-exts Code Issues 52 Pull requests 1 Projects Niemals. If not, then
> assign the argument to sacFile1, and go on with the rest.

It would be cleanest to have

realWork :: FileName -> IO ()
realWork file Why shared_timed_mutex is defined in c++14, but shared_mutex in c++17?

Did you change anything besides removing the "do" and "return ()" from the then-branch and insert the "do" in the else-branch? Thank you very much! It would be cleanest to have realWork :: FileName -> IO () realWork file = do sacFile1 <- openBinaryFile file ReadMode ... How do I replace and (&&) in a for loop?

I was trying to shadow x and y, not use their previous values. then ...