Re: `show' in ghci dialogue

12 Jan 2008


      On Sat, Jan 12, 2008 at 01:11:00PM +0000, Neil Mitchell wrote:
...
Hi Serge,
I think what you are looking for is putStr:
ghci> putStr "Test\nhere"
Test
here
Thank you.
And my `main' function below did apply  putStr. 
I am sorry, I got confused: cannot recall in what situation its 
output was 
"[([1, 2, 3), []),\n\n([4, 5, 6), [7]),\n\n([9, 8, 0],\n\n[0, 0, 0])]"

How strange ...
...
On 1/12/08, Serge D. Mechveliani  wrote:
...
[..]
---------------------------
class DShow a where dShow :: ShowOptions -> a -> String
...
main = let listOfListPairs = [ ([1,2,3], []     ),
                               ([4,5,6], [7]    ),
                               ([9,8,0], [0,0,0])
                             ]                     :: [ ([Int], [Int]) ]
           opts = ShowOptions {verbosity      = 2,
                               listSepator    = ", \n\n",
                               fieldSeparator = ", \n"}
       in
       putStr (dShow opts listOfListPairs)
---------------------------
Then, the command  ./Main  outputs
-----------------------
[([1, 2, 3], []),
([4, 5, 6], [7]),
([9, 8, 0], [0, 0, 0])]
-----------------------
[..]
But the command
...
main
in the ghci interpreter outputs something like this:
"[([1, 2, 3), []),\n\n([4, 5, 6), [7]),\n\n([9, 8, 0],\n\n[0, 0, 0])]"
[..]