Re: [Haskell-cafe] Re: Unexpected results with simple IO

2006-02-20 Thread Emil Axelsson 
Unfortunately, I don't know how to make the arrow keys work in rxvt. I'm not the 
right person to ask about such things...

I don't think it's possible (unless GHC is built for Cygwin, or something).
Does anybody else know?

I use an alias

  alias ghciW='cmd /c start ghci'

That way I can start GHCi in a new DOS window from rxvt. I usually want two 
windows anyway -- one for the interactive session and one to compile other modules.


/ Emil



Maurício skrev:
  I'm also using GHC 6.4.1 and rxvt v2.7.10. The problem does occur in 
compiled code, but everything is OK in ghci!

  hFlush stdout did solve the problem, as expected.
  I've just started using rxvt. If you have tips on how to make ghci 
work well with rxvt, please share them with me (for instance, how to set 
the top arrow to repeat the last line, instead of moving the cursor one 
live above. I don't understand very well how those applications handle 
keyboard).


  Best,
  Maurício

Emil Axelsson wrote:

What version of GHC are you using?
Your code works for me in rxvt in Cygwin, with GHC 6.4.1. But I 
remember having that same problem earlier (in some earlier GHC 
version, so it may be fixed by now).


The solution was to run hFlush after each putStr, like so:

  import System.IO (hFlush, stdout)

  do putStr "..."
 hHlush stdout
 ...

If I remember correctly, the problem only occurred in GHCi and Hugs -- 
not when compiling the code.


/ Emil



Maurício skrev:

  You're right... I was running the example in rxvt, in cygwin. Now I 
tried in Windows command shell and it works.


  Thanks,
  Maurício

Cale Gibbard wrote:


That doesn't happen for me at all, it works just fine. Maybe it's
something wrong with your terminal? You could possibly try playing
with the buffering settings on stdout, using hSetBuffering in
System.IO.

 - Cale

On 17/02/06, Maurício <[EMAIL PROTECTED]> wrote:


  Dear Haskell users,

  I have a problem using IO. The small test program below asks the 
user

to guess from a list of random numbers between 1 and 10. Everything
works well excepts for one problem: all the messages ("Guess a
number...", "Right..." and "Wrong...") are printed after the program
finishes, i.e., I have to use it blind. I'm afraid I misunderstand
something important about lazyness or monads... What am I doing wrong?

  Thanks,
  Maurício

module Main where
import Random

main = do
   r_gen <- getStdGen --random generator
   let r_list = (randomRs (1,10) r_gen) --random list
   guess_loop (r_list)

guess_loop (r:r_others) = do
   putStrLn "Guess a number between 1 and 10:"
   n <- readLn
   if n==r
  then do
 putStrLn "Right! :)"
 return ()
  else do
 putStrLn "Wrong... :("
 guess_loop r_others

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[Haskell-cafe] Re: Unexpected results with simple IO

2006-02-20 Thread Maurício 
  I'm also using GHC 6.4.1 and rxvt v2.7.10. The problem does occur in 
compiled code, but everything is OK in ghci!

  hFlush stdout did solve the problem, as expected.
  I've just started using rxvt. If you have tips on how to make ghci 
work well with rxvt, please share them with me (for instance, how to set 
the top arrow to repeat the last line, instead of moving the cursor one 
live above. I don't understand very well how those applications handle 
keyboard).


  Best,
  Maurício

Emil Axelsson wrote:

What version of GHC are you using?
Your code works for me in rxvt in Cygwin, with GHC 6.4.1. But I remember 
having that same problem earlier (in some earlier GHC version, so it may 
be fixed by now).


The solution was to run hFlush after each putStr, like so:

  import System.IO (hFlush, stdout)

  do putStr "..."
 hHlush stdout
 ...

If I remember correctly, the problem only occurred in GHCi and Hugs -- 
not when compiling the code.


/ Emil



Maurício skrev:

  You're right... I was running the example in rxvt, in cygwin. Now I 
tried in Windows command shell and it works.


  Thanks,
  Maurício

Cale Gibbard wrote:


That doesn't happen for me at all, it works just fine. Maybe it's
something wrong with your terminal? You could possibly try playing
with the buffering settings on stdout, using hSetBuffering in
System.IO.

 - Cale

On 17/02/06, Maurício <[EMAIL PROTECTED]> wrote:


  Dear Haskell users,

  I have a problem using IO. The small test program below asks the user
to guess from a list of random numbers between 1 and 10. Everything
works well excepts for one problem: all the messages ("Guess a
number...", "Right..." and "Wrong...") are printed after the program
finishes, i.e., I have to use it blind. I'm afraid I misunderstand
something important about lazyness or monads... What am I doing wrong?

  Thanks,
  Maurício

module Main where
import Random

main = do
   r_gen <- getStdGen --random generator
   let r_list = (randomRs (1,10) r_gen) --random list
   guess_loop (r_list)

guess_loop (r:r_others) = do
   putStrLn "Guess a number between 1 and 10:"
   n <- readLn
   if n==r
  then do
 putStrLn "Right! :)"
 return ()
  else do
 putStrLn "Wrong... :("
 guess_loop r_others

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Re: [Haskell-cafe] Re: Unexpected results with simple IO

2006-02-19 Thread Emil Axelsson 

What version of GHC are you using?
Your code works for me in rxvt in Cygwin, with GHC 6.4.1. But I remember having 
that same problem earlier (in some earlier GHC version, so it may be fixed by now).


The solution was to run hFlush after each putStr, like so:

  import System.IO (hFlush, stdout)

  do putStr "..."
 hHlush stdout
 ...

If I remember correctly, the problem only occurred in GHCi and Hugs -- not when 
compiling the code.


/ Emil



Maurício skrev:
  You're right... I was running the example in rxvt, in cygwin. Now I 
tried in Windows command shell and it works.


  Thanks,
  Maurício

Cale Gibbard wrote:

That doesn't happen for me at all, it works just fine. Maybe it's
something wrong with your terminal? You could possibly try playing
with the buffering settings on stdout, using hSetBuffering in
System.IO.

 - Cale

On 17/02/06, Maurício <[EMAIL PROTECTED]> wrote:


  Dear Haskell users,

  I have a problem using IO. The small test program below asks the user
to guess from a list of random numbers between 1 and 10. Everything
works well excepts for one problem: all the messages ("Guess a
number...", "Right..." and "Wrong...") are printed after the program
finishes, i.e., I have to use it blind. I'm afraid I misunderstand
something important about lazyness or monads... What am I doing wrong?

  Thanks,
  Maurício

module Main where
import Random

main = do
   r_gen <- getStdGen --random generator
   let r_list = (randomRs (1,10) r_gen) --random list
   guess_loop (r_list)

guess_loop (r:r_others) = do
   putStrLn "Guess a number between 1 and 10:"
   n <- readLn
   if n==r
  then do
 putStrLn "Right! :)"
 return ()
  else do
 putStrLn "Wrong... :("
 guess_loop r_others

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[Haskell-cafe] Re: Unexpected results with simple IO

2006-02-17 Thread Maurício 
  You're right... I was running the example in rxvt, in cygwin. Now I 
tried in Windows command shell and it works.


  Thanks,
  Maurício

Cale Gibbard wrote:

That doesn't happen for me at all, it works just fine. Maybe it's
something wrong with your terminal? You could possibly try playing
with the buffering settings on stdout, using hSetBuffering in
System.IO.

 - Cale

On 17/02/06, Maurício <[EMAIL PROTECTED]> wrote:


  Dear Haskell users,

  I have a problem using IO. The small test program below asks the user
to guess from a list of random numbers between 1 and 10. Everything
works well excepts for one problem: all the messages ("Guess a
number...", "Right..." and "Wrong...") are printed after the program
finishes, i.e., I have to use it blind. I'm afraid I misunderstand
something important about lazyness or monads... What am I doing wrong?

  Thanks,
  Maurício

module Main where
import Random

main = do
   r_gen <- getStdGen --random generator
   let r_list = (randomRs (1,10) r_gen) --random list
   guess_loop (r_list)

guess_loop (r:r_others) = do
   putStrLn "Guess a number between 1 and 10:"
   n <- readLn
   if n==r
  then do
 putStrLn "Right! :)"
 return ()
  else do
 putStrLn "Wrong... :("
 guess_loop r_others

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