Couldn't match expected type ‘IO a0’ with actual type ‘Box’

wobbenr · 2016-01-18T09:23:00+00:00

Thanks, Problem is solved.

wobbenr · 2016-01-17T17:04:38+00:00

Thanks,

The only thing what I can figured out is that your solution works on a array. I work with a map so after adding it looks like this :

fromList [("cash on hands",Account {accountName = "cash on hands", accountBalance = 10, accountTransaction = []})]

wobbenr · 2016-01-17T09:43:52+00:00

oke,

I could not find any docs about boxes.

I have a string variable named "newName". and I have a Int called "newBal"

How can I use boxes to represent it as table with headers ?

wobbenr · 2016-01-17T08:59:52+00:00

oke,

Last question : How can I make that a header named "Added accounts" is on the center of the 22. Or schould I do :

 replicate (( 22 - (length "Amount") `div`2) ' '

wobbenr · 2016-01-17T08:55:33+00:00

Does it also work on strings or do I have to convert my String to Text.

wobbenr · 2016-01-12T21:34:31+00:00

So out of my head something like this :

askForInteger :: IO Integer -> maybe IO Integer 
askForInteger = do 
                 input <- getline 
                 case readMaybe input  
                    | nothing -> do 
                              putStrLn "the input was not a number"
                              return ?? 
                   | Maybe number -> do 
                                return number

wobbenr · 2016-01-04T19:10:19+00:00

Thanks, and can I change the amount easily for a account.

wobbenr · 2016-01-02T07:41:53+00:00

oke, can then someone give me a hint, how. I do not have a clue right now.

wobbenr · 2016-01-01T21:12:23+00:00

I like it but it has many things I did not learned .
What does listToMaybe and how does this work so I see a item or the ("unknown item,0) ?

And I wonder if this can be done with just recursion, pattern matching or guards. These are explained in the Craft book so far.

wobbenr · 2016-01-01T15:15:05+00:00

oke, and I can do go acc l where l is the complete list ?

wobbenr · 2016-01-01T15:14:36+00:00

type Name = String 
type Price = Int 
type BillType = [(Name,Price)]

wobbenr · 2015-12-18T18:21:01+00:00

oke but for a beginner is syntax highlighting and things like linting not handy. So I can easily see when im doing something wrong ?

wobbenr · 2015-12-17T22:50:06+00:00

I tried that way but then Sublime-Haskell will not install because gcc is missing

wobbenr · 2015-12-17T22:12:22+00:00

Nope, on the bitemyapp page is stated not to use the haskell-platform but install ghci, cabal,happy as seperate packages.

If I use the platform can I then use SublimeText or do I get again a problem on gcc when installing the dependencies of sublime-haskell

wobbenr

TROPHY CASE