using System;

​

public class RandomTest

{

    public static void Main()

    {

        Random rnd_out_loop = new Random();     // A seed that isn't reset every loop, as a reference.

        // First case, no delay mechanism. The Random() in the loop executes correctly, but it loops so quickly it gets the same seed

        // every time. The seed typically comes from the system clock or other hardware parameters. If these hardware parameters are

        // constant over the timescales we're working on, you'll get the same seed when you call Random(). So, although it does actually

        // update the seed, it updates with the same value it already had and thus doesn't appear to have worked as you might expect.

        for (int cycle = 0; cycle < 10; cycle++)    {

            Random rnd_in_loop = new Random();  // A seed that is reset every loop.

​

            int rnd_in = rnd_in_loop.Next(100);

            int rnd_out = rnd_out_loop.Next(100);

            Console.WriteLine("Prompt Loop " + cycle + ": rnd_in = " + rnd_in + ", rnd_out = " + rnd_out);

        }

​

        // Second case, with a delay mechanism. This time the system clock that Random() gets its seed from has actually changed between

        // iterations of the loop. It functions identically to the loop above, the only difference is the delay. This means that when

        // the variable is updated it actually gets a different seed to update with.

        for (int cycle = 0; cycle < 10; cycle++)    {

            System.Threading.Thread.Sleep(10);  // Sleep for 10 milliesconds. This is more than enough time for Random() to get a fresh seed

                                                // as a result of the hardware device it sources the seed from having changed in this time.

            Random rnd_in_loop = new Random();  // A seed that is reset every loop.

            int rnd_in = rnd_in_loop.Next(100);

            int rnd_out = rnd_out_loop.Next(100);

​

            Console.WriteLine("Delayed Loop " + cycle + ": rnd_in = " + rnd_in + ", rnd_out = " + rnd_out);

        }

    }

}

​