Re: lazy Printing question

On Mon, Jul 21, 2003 at 05:41:32PM +0530, AJ wrote:

Hi everyone,

Hi!

I have written the following program to find "magic numbers" i.e. integers 'n' such that both (n+1) and (n/2+1) are perfect squares.

Import IO

main :: IO () main = do print (filter magicP sqs)

Now my question is - How do I reproduce such "lazy printing" behaviour in GHC?

My guess would be to try running main = putStr $ unlines $ map show $ filter magicP sqs It may be that print is doing something like checking the length of the list which would of course not allow for lazy printing. -- David Roundy http://www.abridgegame.org