如何在每次运行lua脚本时生成随机值

Question

I have written a lua script named which contains following code:

function random_number_func()
    math.randomseed(os.time())
    return (math.random(100000000,999999999))
end

print (random_number_func())

when I run the script in the terminal in loop , the above function is not generating randome values as shown :

for ((i=0;i<=5;i++)); do lua lua_rand_gen; done

717952767
717952767
717952767
717952767
717952767
717952767

I know this is because doesn't change till one second. So, how can I get Random number in lua if the time difference between running the lua script is less than 1 sec.

Answer 1

Move math.randomseed(os.time()) outside the function.

It seems to be a common misconception that you need to call math.randomseed before each time you call math.random . This is wrong and will defeat the randomness of math.random , especially if you use os.time() as seed, since the seeds will be the same for a whole second.