Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

random numbers

Posted on 2006-06-24
5
339 Views
Last Modified: 2010-04-16
I am trying to create random 22 digit numbers...

I tried the randomclass.Next with 22 9's but I get an error that int cannot be a long
Example code would be great.....


any ideas????






0
Comment
Question by:bman9111
  • 3
5 Comments
 
LVL 85

Expert Comment

by:Mike Tomlinson
ID: 16975540
How about?

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = RandomNumber(22);
        }

        private string RandomNumber(byte length)
        {
            StringBuilder sb = new StringBuilder();
            Random R = new Random();
            for (int i = 1; i <= length; i++)
            {
                if (i == 1)
                {
                    sb.Append(R.Next(1, 10).ToString());
                }
                else
                {
                    sb.Append(R.Next(0, 10).ToString());
                }
            }
            return sb.ToString();
        }

or?

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = RandomNumber(22);
        }

        private string RandomNumber(byte length)
        {
            StringBuilder sb = new StringBuilder();
            do
            {
                sb.Append(Guid.NewGuid().ToString("N").ToLower()
                    .Replace("a","").Replace("b","").Replace("c","")
                    .Replace("d","").Replace("e","").Replace("f",""));
                if (sb[0] == '0')
                {
                    sb.Remove(0, 1);
                }
            } while (sb.Length < length);
            sb.Length = length;
            return sb.ToString();
        }
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 16975574
Hi bman9111;

Here is another way to do what you want.

        Dim rand As New Random(Now.Second())
        Dim rn As Decimal = rand.Next(1000000000, 2147483647)
        rn = (rn * 10000000000 + rand.Next(1000000000, 2147483647)) * 100 + rand.Next(100)
        Label1.Text = rn.ToString()

Fernando
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 125 total points
ID: 16975605
And in C# it would be

        Random rand = new Random(DateTime.Now.Second);
        decimal rn = rand.Next(1000000000, 2147483647);
      rn = (rn * 10000000000 + rand.Next(1000000000, 2147483647)) * 100 + rand.Next(100);
      label1.Text = rn.ToString();


Fernando
0
 
LVL 8

Author Comment

by:bman9111
ID: 16976056
what does the number 2147483647

represent..... can that be anything????
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 16976417
Because the Random object only returns a positive integer number and integer range is between -2,147,483,648 to 2,147,483,647, 2147483647 is the largest integer value possible.

To your question, "can that be anything????"

In the code sample I gave it can be anything greater then 1000000000 but less then or equal to 2147483647. The reason is that you want a 22 digit number, so concatenating two 10 digit number and a two digit number will give a 22 digit number.
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In order to hide the "ugly" records selectors (triangles) in the rowheaders, here are some suggestions. Microsoft doesn't have a direct method/property to do it. You can only hide the rowheader column. First solution, the easy way The first sol…
Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question