[Haskell-cafe] How can i set the seed random number generator ?

[Scott Turner]

On Monday 21 December 2009 20:37:30 zaxis wrote:
> In erlang, first i use the following function to set the seed:
> new_seed() ->
>     {_,_,X} = erlang:now(),
>     {H,M,S} = time(),
>     H1 = H * X rem 32767,
>     M1 = M * X rem 32767,
>     S1 = S * X rem 32767,
>     put(random_seed, {H1,M1,S1}).
> 
> then use random:uniform/1 to get the random number.
> 
> In haskell, i just use the following function to get the random number. It
> seems i donot need to set the seed of random number generator manually?
> 
> rollDice ::  Int -> IO Int
> rollDice n = randomRIO(1,n)

That's correct.   randomRIO uses the global random number generator which is 
automatically initialized with a different seed each time your program starts 
up.