Avoiding random duplicates

Question

System.Random generator = new Random(DateTime.Now.Millisecond);
int[] lotteryNumber = new int[7];

Console.WriteLine(\"Your lottery numbers: \");
for (int i = 0; i&l         


        

Answer 1

HashSet set = new HashSet();
System.Random generator = new Random(DateTime.Now.Millisecond);

while(set.Count < 7){
    set.Add(generator.Next(1,37);
}

That should work, since a HashSet will automatically ignore duplicates. Just loop until the set reaches the number of units you need. Only potential problem is it has the POTENTIAL (unlikely) to loop for a long time, but it should eventually respond.