ldou, LD> How to get different two random numbers, and use the two LD> numbers in program,e.g LD> x = b + c LD> where LD> b && c are different random numbers between 1..n Have a look at the Random module from the standard libraries.

module Test where import Random

test :: Integer -> IO Integer test n = do b <- randomRIO (1, n) c <- randomRIO (1, n) let x = b + c return x

HTH, Stefan