Random Numbers Generator

[dr3amxstar]

Hi All, sorry for posting so many questions. Im a newbie but im trying to learn :D
With Regards to SammyB Code :

Public Class Form1
    Private oRand As Random
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        oRand = New Random(DateTime.Now.Millisecond)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim iRand As Integer
        iRand = oRand.Next(1, 10)
        MsgBox(iRand)
    End Sub
End Class

I tried implementing it into my program but i change this line
iRand = oRand.Next(1,10) to iRand = oRand.Next(-0.3,0.3) as i want my range to be from -0.3 to 0.3. However the the value 0 kept appearing when i click the button. Why is it so? I will have to store the random values in an array as well. array(0 To 10919). Is it possible as well?

[ChillUmesh]

Hi All, sorry for posting so many questions. Im a newbie but im trying to learn :D
With Regards to SammyB Code :

Public Class Form1
    Private oRand As Random
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        oRand = New Random(DateTime.Now.Millisecond)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim iRand As Integer
        iRand = oRand.Next(1, 10)
        MsgBox(iRand)
    End Sub
End Class

I tried implementing it into my program but i change this line
iRand = oRand.Next(1,10) to iRand = oRand.Next(-0.3,0.3) as i want my range to be from -0.3 to 0.3. However the the value 0 kept appearing when i click the button. Why is it so? I will have to store the random values in an array as well. array(0 To 10919). Is it possible as well?

Try this one
for i=0 to 10919
array(i)=(rnd*0.6)-0.3
next


this generates random numbers ranging from -0.3 to 0.3

[Killer42]

The problem is that you are storing these numbers in an Integer variable, which can only hold whole numbers. They are rounded to the nearest integer, which in this case is zero. Try using another numeric data type such as Single.

[dr3amxstar]

The problem is that you are storing these numbers in an Integer variable, which can only hold whole numbers. They are rounded to the nearest integer, which in this case is zero. Try using another numeric data type such as Single.

Previously i have tried changing it the double and single as well but it doesnt work also.. It gave me zero too

[dr3amxstar]

Try this one
for i=0 to 10919
array(i)=(rnd*0.6)-0.3
next


this generates random numbers ranging from -0.3 to 0.3

Hi i tried and it works. I just want to ask, how is it different from sammyB code? why a seed is not used in here or it is not neccessary at all? Why do you times 0.6?

[Killer42]

Hi i tried and it works. I just want to ask, how is it different from sammyB code? why a seed is not used in here or it is not neccessary at all? Why do you times 0.6?

This code is simply generating a random number between zero and 0.6 (twice your limit) then subtracting half. The effect of this is to give you a number between -0.3 and +0.3.

Also, array() must be of a different type to the integer variable you were using before. If you didn't specify the type, then I suppose it will be the default type, which would be Variant in VB6, and I think Object in later versions.

[dr3amxstar]

This code is simply generating a random number between zero and 0.6 (twice your limit) then subrtacting half. The effect of this is to give you a number between -0.3 and +0.3.

Also, array() must be of a different type to the integer variable you were using before. If you didn't specify the type, then I suppose it will be the default type, which would be Variant in VB6, and I think Object in later versions.

Hmm this simple code suits my program since i only need to generate random code once throughout my entire program. thanks alot for all your help! Im on the right track now i hope! :D

[Killer42]

Hmm this simple code suits my program since i only need to generate random code once throughout my entire program. thanks alot for all your help! Im on the right track now i hope! :D

Glad we could help. :)

Let us know how it turns out.

(If you come up with new questions along the way, please post them as new discussion threads, don't just tack them onto the end of this one. People often ignore old threads, and just look for new ones to answer, so you'll get a better response that way.)

[dr3amxstar]

Glad we could help. :)

Let us know how it turns out.

(If you come up with new questions along the way, please post them as new discussion threads, don't just tack them onto the end of this one. People often ignore old threads, and just look for new ones to answer, so you'll get a better response that way.)

Ok i got it! I will post my code as soon as i am done with it! :D

[SammyB]

Hi All, sorry for posting so many questions. Im a newbie but im trying to learn :D
With Regards to SammyB Code, http://www.thescripts.com/forum/thread641768.html

I tried implementing it into my program but i change this line
iRand = oRand.Next(1,10) to iRand = oRand.Next(-0.3,0.3) as i want my range to be from -0.3 to 0.3. However the the value 0 kept appearing when i click the button. Why is it so? I will have to store the random values in an array as well. array(0 To 10919). Is it possible as well?

Glad that you figured it out. I tried to post last night, but the router crashed. Assuming that you are using VB.Net, as you discovered oRand.Next(...) always returns an integer; however, there is also .NextDouble() which is the same as VB6 rnd(). So, the code should look like:

Public Class Form1
    Private oRand As Random
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        oRand = New Random(DateTime.Now.Millisecond)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim dRand As Double
        dRand = oRand.NextDouble()
        Dim dOffset As Double = -0.3
        Dim dRange As Double = 0.3 - dOffset    ' = 0.6 in this case
        dRand = oRand.NextDouble() * dRange + dOffset
        MessageBox.Show(dRand)
    End Sub
End Class
 

[dr3amxstar]

Glad that you figured it out. I tried to post last night, but the router crashed. Assuming that you are using VB.Net, as you discovered oRand.Next(...) always returns an integer; however, there is also .NextDouble() which is the same as VB6 rnd(). So, the code should look like:

Public Class Form1
    Private oRand As Random
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        oRand = New Random(DateTime.Now.Millisecond)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim dRand As Double
        dRand = oRand.NextDouble()
        Dim dOffset As Double = -0.3
        Dim dRange As Double = 0.3 - dOffset    ' = 0.6 in this case
        dRand = oRand.NextDouble() * dRange + dOffset
        MessageBox.Show(dRand)
    End Sub
End Class
 

Thanks! I tried and it works too. May i know what is the difference between this code and the code from ChillUmesh?

[bIGMOS]

Thanks! I tried and it works too. May i know what is the difference between this code and the code from ChillUmesh?

Hi. I am trying to generate random numbers between 1000 and 9999.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Randomize()
Dim iRand As Integer
iRand = oRand.Next(1000, 9999)
 
' This is where I want 4 DIFFRENT RANDOM NUMBERS BUT THEY'RE RANDOMLY THE SAME AHHH''''
'TextBox1.Text = (iRand)
'TextBox2.Text = (iRand)
'TextBox3.Text = (iRand)
'TextBox4.Text = (iRand)
End Sub

How can I get 4 different random numbers at each click? Thanks in advance for the help.

[Killer42]

Look at it logically. You generated a random number, and placed it in a variable. However many times you access that variable it will still contain the same value, unless you change it.

I'd say the most obvious options are...

• Assign another random number to variable iRand before each of the statements where you use it.
• Create an array with four elements, and place a random number in each, then use those. (This is probably overkill, though.)
• Don't bother placing the number in a variable at all - just use the oRand.Next(1000, 9999) in each case.