1 --!!! a random test from Nick North
2 -- (got this in mid-1993; don't remember why. WDP 95/02)
5 random_numbers :: (Int, Int, Int) -> [Float]
6 random_numbers (s1,s2,s3)
7 = map (snd . properFraction . combine) (iterate f (s1,s2,s3))
9 combine :: (Int,Int,Int) -> Float
11 fromIntegral(a)/30269 + fromIntegral(b)/30307
12 + fromIntegral(c)/30323
14 ((171*a) `mod` 30269, (172*b) `mod` 30307, (170*c) `mod` 30323)
16 -- partain: changed to cvt spaces into newlines (easier to see bugs)
17 -- sof: define approp. version of showList to do this.
18 main = putStr (showL (showsPrec 0) (take 1000 (random_numbers (9807, 65, 32975))) "\n")
20 showL showx [] = showString "[]"
21 showL showx (x:xs) = showChar '[' . showx x . showl xs
23 showl [] = showChar ']'
24 showl (x:xs) = showString ",\n" . showx x . showl xs