November 7, 2004
Imprinting on "randomness"
Well, that's just a simple level 100 quiz aiming to imprint "standard random number generators are not really random" program to those who still lack it. What will produce the following C# snippet?
System.Random rnd = new System.Random(12345);
System.Random rnd2 = new System.Random(12345);
for (int i=0; i<1000; i++)
if (rnd.Next() != rnd2.Next())
Console.WriteLine("Truly random!");
del.ico.us
digg it
redditA more subtle variation occurs if you create an instance of a System.Random on each of a pool of threads at startup. If you're not careful they can all start with the same seed (based on the clock) and produce identical sequences. Not usually what you mean to do ;)
Posted by: Jason Whittington at November 20, 2004 8:58 PMThe result will be the empty string.
It is wellknown that if you start from the same seed you'll get the same sequence of numbers.
Cheers,
Dimitre.
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