Question

I am trying to generate 10 random numbers in Haskell mkStdGen in the range of 0 (inclusive) to 100 (exclusive).

Something equivalent of the following Java code

Random ran = new Random();
ran.nextInt(100);

Note, I have to use mkStdGen

This is what I have so far

rand low high seed = fst (randomR (low, high) (mkStdGen seed))
randomlist :: Int -> Int -> Int -> [Int]
randomlist l h num = take num (map (rand l h) [0..])


Answer 1

import System.Random

tenPseudorandomNumbers :: Int -> [Int]
tenPseudorandomNumbers seed = take 10 . randomRs (0, 99) . mkStdGen $ seed

Note that this isn’t really pseudorandom, because mkStdGen takes an explicit seed. newStdGen would be better, if you’re allowed to run in IO.