ghci

I've installed the Haskell platform on my OSX (Yosemite). When I try to execute the ghci, the following error occurs: GHCi, version 7.8.4: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ......

I'm new to Haskell. Following list comprehension dose not work good. ghci stop it's output. (after type '7', ghci stop long long time.) Prelude Data.Numbers.Primes> [x | x <- primes, x <= 10] Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done....

I want to make a function in haskell that given a list of single digits, i make the full number. I was thinking in using intensive lists and patrons, as the code it follows: funcion5 (x:xs) = [y*(10^w) | y <- (x:xs) w] The idea is, to go over the list and multiplie each digit to 10 pow to the...

I have a Haskell program using the FFI to import C++ functions. I'm using Windows. When I compile to an executable or to a DLL, this works. But when I load a module in GHCI, this doesn't always work: sometimes this works, sometimes I get Access violation in generated code when reading...

I want to manually derive the type of: f1 x xs = (filter . (<)) x xs First time we see x , so: x :: t1 Then (<) has this type: (<) :: Ord a1 => a1 -> a1 -> Bool We can only say (< x) if the following types can be unified: t1 ~ a1 Then x :: a1 So (<x) :: Ord a1 => a1 -> Bool Filter has this type...

^-- No, it doesn't entirely. My question covers ADDING patterns and type signatures interactively...which is apparently impossible. The most basic things you might try do from early tutorials won't work in GHCi: foo [] = [] foo (x:xs) = x : foo xs That works if you put it into foo.hs and at the GHCi...

I am attempting to write a trivial function to drop the last digit of a number and return the rest of the number. dropLastDigit :: (Integral b) => b -> b dropLastDigit x = (quot x 10) * (floor $ logBase 10 x) however, when I try to load this into ghci, I get: Could not deduce (Floating b) arising...

If we look at the source of The random package we have a file Random.hs . Because of CPP extensions one has to invoke ghci via the following command : ghci -cpp Random.hs Alternatively one can do : ghci -cpp and then from within ghci : Prelude GOA> :load Random [1 of 1] Compiling System.Random (...

The following program does not explode when the executable (compiled via ghc -O0 Explode.hs ) is run, but does explode when run in ghci (via either ghci Explode.hs or ghci -fobject-code Explode.hs ) : --Explode.hs --Does not explode with : ghc -O0 Explode.hs --Explodes with : ghci Explode.hs -...

Hi i have the following code import Data.Maybe import Test.QuickCheck import System.Random rndExpr :: Gen Expr -> IO Expr rndExpr gen = do rnd <- newStdGen return (generate 5 rnd gen) But i get "not in scope "generate", why is this so? Regards Darren Edit i am importing Test.QuickCheck but it still...