Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.3k views
in Technique[技术] by (71.8m points)

how to avoid number repeation by using random class in c#?

hi i am using Random class for getting random numbers but my requirement is once it generate one no that should not be repeate again pls help me.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Keep a list of the generated numbers and check this list before returning the next random.

Since you have not specified a language, I'll use C#

List<int> generated = new List<int>;
public int Next()
{
   int r;
   do {  r = Random.Next() } while generated.Contains(r);
   generated.Add(r);
   return r;
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...