October 2007 - Hugs-Users

A few comments on WinHugs-sep2006.exe
by Thorkil Naur 27 Oct '07

27 Oct '07

Hello, As an enthusiastic Hugs user, I recently installed Hugs using WinHugs-Sep2006.exe and noted the following: 1. When running hugs.exe from an ordinary DOS prompt, activating the editor (Notepad) using :e returns control immediately to the Hugs prompt, in addition to starting the Notepad. So, although I am able to edit the desired (Haskell) source file, I need to do a :r after saving, to make Hugs aware of the changes. This is certainly different from what I have experienced with earlier Hugs'es where :e did not return until edits were completed, enabling Hugs to respond to the most recent edits immediately. 2. Running hugs.exe from a DOS prompt reports the version as 20051031 whereas activating WinHugs reports Version Sep 2006. 3. In the WinHugs menu, the menu item Help has it's "l" underscored. Nevertheless, Alt-h is what is required to activate the help menu. I will gladly enter Hugs trac issues for these items if convenient. Thanks and best regards Thorkil

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School assignment help
by Urmastaag 25 Oct '07

25 Oct '07

Hello! Can anybody point me to a right way here? I have those exercises in haskell that i cannot do, because haskell is so much different from other languages that i use. I have read so much from different manuals but i do not understand haskell enough yet. First exercise: I must find a shorter list. Here's how i did that, but my teacher said that it is unefficient way to do it. getShorter :: [a] -> [a] -> [a] getShorter xs ys | length xs <= length ys = xs | otherwise = ys How do i do it effective, so that i only check as many elements from lists as many are in the shortest list? Second exercise: Second exercise also need an effective answer: I have to remove any occurances of certain number from list and give the number of how many times that number was removed. Unefficient version: remCount :: Int -> [Int] -> (Int,[Int]) remCount n xs = (length xs - length ys, ys) where ys = [ x | x <- xs, x /= n] Exercise three: moneyBack :: Int -> [(Int,Int)] I must print out all pairs of bank notes and (bank notes, how many) which salesman would give me back when he/she has to give me like 456 back. moneyBack 0 ==> [] moneyBack 10 ==> [(10,1)] moneyBack 123 ==> [(100,1),(10,2),(2,1),(1,1)] moneyBack 5326 ==> [(500,10),(100,3),(25,1),(1,1)] If anybody could point me in a right direction that would be great. Haskell seems very cool because the code is usually really short, but i just need a start. I need more examples than i can find from google (maybe i'm not using the right keywords). Thanks. -- View this message in context: http://www.nabble.com/School-assignment-help-tf4685176.html#a13388655 Sent from the Haskell - Hugs-Users mailing list archive at Nabble.com.

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Graphics Library for Hugs
by ferronrsmith 08 Oct '07

08 Oct '07

I want to create some GUI in hugs (I know GHC works) for class, but I just can't seem to find any for hugs help??? is there any available ??? -- View this message in context: http://www.nabble.com/Graphics-Library-for-Hugs-tf4588765.html#a13098425 Sent from the Haskell - Hugs-Users mailing list archive at Nabble.com.

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