Random Generator for nine numbers

[lildiapaz]

Hi,

I'm trying to generate nine random numbers in visual c# 2005 for a windows application. No input will be needed from the user. All that is needed is the nine random integers. Any help will be appreciatied

[RedSon]

What have you done so far? You should just be able to do something like Random.nextInt and keep getting more ints.

[sendhiltam]

Dim MyInteger As Integer
Randomize
MyInteger = CInt(Int((9 * Rnd()) + 1))

[kenobewan]

What problem or error are you getting?

[lildiapaz]

The problem that I am getting is that I want to generate nine integer numbers
example: 028492992
292402012
etc.

When I tried to use the random method in c# , I am not getting nine random integers. I am getting an error.

private void random_drivers_license(int min, int max, string license)
{
max++;
for(int ct=0; ct<9; ct++)

StringBuilder builder = new StringBuilder();
System.Random Randomnum = new System.Random();
int random_num = Randomnum.Next(min, max);

}

Can someone please help?

[TRScheel]

The code might be running too fast. Use one instance of the Random class, like this:

private static string Random_Drivers_License(int min, int max)
{
    string license = string.Empty;
    Random rnd = new Random();
 
    for (int i = 0; i < 9; i++)
    {
        license += rnd.Next(min, max + 1).ToString();
    }
 
    return license;
}
 

[lildiapaz]

Thanks, for your help. Do I have to include a seed with my random function to make sure that the values don't repeat when executed more than once? Because I want to generate nine different numbers each time at runtime.

The code might be running too fast. Use one instance of the Random class, like this:

private static string Random_Drivers_License(int min, int max)
{
    string license = string.Empty;
    Random rnd = new Random();
 
    for (int i = 0; i < 9; i++)
    {
        license += rnd.Next(min, max + 1).ToString();
    }
 
    return license;
}
 

[TRScheel]

Thanks, for your help. Do I have to include a seed with my random function to make sure that the values don't repeat when executed more than once? Because I want to generate nine different numbers each time at runtime.

It seeds with time if you dont include a value, but if you create the random number generator in the loop, chances are the loop goes so fast each creation uses the same seed and thus creates the same value.

[lildiapaz]

It seeds with time if you dont include a value, but if you create the random number generator in the loop, chances are the loop goes so fast each creation uses the same seed and thus creates the same value.

Ok, so it is best to only create one instance of the random function outside the loop. i tried to run the method and it didn't return any results? What could be the cause of this?

[TRScheel]

Ok, so it is best to only create one instance of the random function outside the loop. i tried to run the method and it didn't return any results? What could be the cause of this?

Your method or mine?

[lildiapaz]

Your method or mine?

Your method didn't work when I tried it.

[TRScheel]

Your method didn't work when I tried it.

Can you post your implementation of it?

How you called it, and the class surrounding it? In addition, what references that class is using?

[lildiapaz]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Data.OleDb;
using Microsoft.SqlServer.Server;
using System.Security.Cryptography;
 
namespace Project_3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void label1_Click(object sender, EventArgs e)
        {
 
        }
 
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 
        SqlConnection myConnection = new SqlConnection();
              // System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection();
        textBox1.Text = "Connected!";
          //  myConnection.ConnectionString = "Server=" + textBox1.Text + ";User ID=;  PWD=; database="; 
        //myConnection.ConnectionString = "Server=";Database=myDatabase;User ID=myUsername;Password=myPassword;Trusted_Connection=False; Encrypt=true; Connect Timeout=15";
        myConnection.ConnectionString = "Data Source=" + textBox1.Text + ";User ID=;" + "PWD=";
            SqlCommand thisCommand=myConnection.CreateCommand();
 
            try
               {
                    myConnection.Open();
 
 
                //get databases
                    thisCommand.CommandType = CommandType.StoredProcedure;
                    thisCommand.CommandText = "sp_databases";
                //get tables
                    DataTable tables = null;
                    tables = myConnection.GetSchema("Tables");
 
                //find all columns in tables
                    SqlPipe p;
                    SqlCommand sql = new SqlCommand();
 
                    sql.CommandText = "SELECT a.column_name, a.data_type, a.character_maximum_length, a.numeric_precision, a.numeric_scale" +
                        "FROM information_schema.columns a INNER JOIN information_schema.tables t ON a.table_name=t.table_name" +
                        "WHERE a.table_name LIKE @search AND a.column_name LIKE @search1 AND t.table_type='BASE TABLE'" + "ORDER BY a.column_name";
                p=SqlContext.Pipe;
                p.ExecuteAndSend(sql);
 
                //find column information
                }
               catch (Exception ex)
                {   
 
                    MessageBox.Show("Failed to connect!");
                    MessageBox.Show("Could not connect to database, please try again!");
                    Application.Restart();
 
                   // create dataset to hold rows, columns, etc
                   DataSet dataset = new DataSet();
 
                }               
                finally
                {
                    myConnection.Close();
                }
                Random_Drivers_License(1, 0xFFFFFF);
        }
        private static string Random_Drivers_License(int min, int max)
        {
            string license = string.Empty;
            Random rnd = new Random();
 
            for (int i = 0; i < 9; i++)
            {
                license += rnd.Next(min, max + 1).ToString();
            }
 
            return license;
        }
 
        }
        }
 
//class1.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
 
namespace Project_3
{
    class Class1
    {
        static void main(string[] args)
        {
            StringBuilder str = new StringBuilder();
            byte[] buffer = new byte[65535];
 
            //request page
            HttpWebRequest request = (HttpWebRequest)
            WebRequest.Create("http://www.census.gov/genealogy/names/dist.female.first");
 
            //execute web page
            HttpWebResponse response =(HttpWebResponse)
            request.GetResponse();
 
            //read data from web page
            Stream read_stream = response.GetResponseStream();
 
            string temp = null;
            int ct = 0;
 
            do
            {
                //fill buffer
                ct = read_stream.Read(buffer, 0, buffer.Length);
                if (ct != 0)
                {
                    temp = Encoding.ASCII.GetString(buffer, 0, ct);
 
                    //append
                    str.Append(temp);
                }
            } while (ct > 0);
 
        }
    }
}
 
//references
ADODB
ADOX
BrowseUI
Interoop.SQLDMO
MMCInternalWebOcx
MSDASC
MSHTML
MSOLAPADMINLib2
MSOLAPUI80
SQLNS
SYSTEM
System.Data
System.XML
 
 

[RedSon]

I spent about 10 minutes fixing and formatting your code and then finally gave up. Please be more considerate of others by being sure to use CODE tags and also formatting your code without hundreds of newlines in between the code blocks.

[TRScheel]

You arent doing anything with the return result. You are essentially making the function idempotent.

Random_Drivers_License(1, 0xFFFFFF);
 

Calling it like that just calls it. It does nothing with the return value, and I could call it a million times and get no result.

string result = string.Empty;
result = Random_Drivers_License(1, 0xFFFFFF);
 

Now you have result. The variable 'result' will contain the return value of the function in question. You can now use that 'result' variable to do something.


A couple notes on your code. You will praise <insert your diety of choice here> a few years from now when you come back to look at your code if you use a good naming convention. Textbox1 is a bad way to start naming things. txtbxStatus is a better name. Thats just an example. Go through each object and do that. In addition, store you connection strings in a web.Config or resource file(I assume resource file as this seems to be a desktop application) that way they are uniform and not copy/pasted in your code everytime you need it. Rule of thumb, embedded strings are bad.

[lildiapaz]

[Thanks, I'll give that a try.

QUOTE=TRScheel]You arent doing anything with the return result. You are essentially making the function idempotent.

Random_Drivers_License(1, 0xFFFFFF);
 

Calling it like that just calls it. It does nothing with the return value, and I could call it a million times and get no result.

string result = string.Empty;
result = Random_Drivers_License(1, 0xFFFFFF);
 

Now you have result. The variable 'result' will contain the return value of the function in question. You can now use that 'result' variable to do something.


A couple notes on your code. You will praise <insert your diety of choice here> a few years from now when you come back to look at your code if you use a good naming convention. Textbox1 is a bad way to start naming things. txtbxStatus is a better name. Thats just an example. Go through each object and do that. In addition, store you connection strings in a web.Config or resource file(I assume resource file as this seems to be a desktop application) that way they are uniform and not copy/pasted in your code everytime you need it. Rule of thumb, embedded strings are bad.[/quote]