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Generate Random Numbers Without Repeating

I need to generate random numbers, from 1 to 15. The program runs a timer, and every second, a new number is generated, but it cannot be one that was already generated. This means that by time the 15th number is reached, it will be automatically chosen.

I have created a way of doing this involving 15 extra variables that are filled when each number is used. It works, but it seems to bog down the timer, since it is checking so many variables. Is there a simpler way of doing this?


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Sub testRandoms(seed As Long)
Randomize seed

For i = 0 To 3
Debug.Print Rnd(1)
Next i
End Sub

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i have this command :
Dim character As String
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print character

but it only generates random numbers... i want to also generate random letters... how can i do this?

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Hi there!
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Any ideas? Thanks!

Taking To Long To Generate Random Numbers/letters
Hey all I have this code I thought up. At first it ran pretty quick but since then the database has filled up with about 65+ database entrees. Problem being is that it really is slow now once the user saves the data.

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Private Sub cmdSave_Click()
Dim rst As ADODB.Recordset
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If cmdSave.Tag <> "GetBC" Then
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Coupons.MousePointer = 0
Set rst = Nothing
Call Bcodeness
Exit Sub
End If
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Set rst = Nothing
End Sub

Public Sub Bcodeness()
Dim n1, n2 As Integer
Dim L1, L2 As String

n1 = Int(Rnd * 12)
n2 = Int(Rnd * 22)
L1 = Int(Rnd * 26) + 65
L1 = Chr$(L1)
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If cmdSave.Tag = "GetBC" Then
End If
End Sub
Any help would be great!


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Non-repeating Psuedo Random Number Generators
I use this from time to time and just thought I'd share it...

' Random Number Functions
' by Mark R Hamner (maxhamner (at)

Private rnd_PR8 As Byte
Private rnd_PR16 As Long

' These routines generate a fixed pattern, BUT, they generate every value in a range
' ONE time before it repeats. This effect is very useful for pixel fades because if
' you use the value to determine a pixel to draw (or erase) it will generate all the
' values only 1 time, meaning all pixels will be addressed without testing or maintaining
' an array. Applications are limited, but VERY useful in specific cases.
' Call routine once passing a seed value, then
' Call it without a value to get successive pseudo random values
' NOTE: The value 0 will not be generated, but can be used as a seed.
' This method was originally in a Dr Dobbs journal in the mid 80's, along with a table
' of mask values that would generate various ranges. I have used this routine 100s of
' times in assembly for various graphics effects (like pixel fades for older palm pilots)
' and converted it to VB to use for a 'block' fade effct (bitblt blocks, not pixels)
' and thought someone might find a good use for it.
' If anyone has a copy of the original article please email it to maxhamner (AT)

' This generates a pseudo random 8 bit (1-256) value
Public Function rnd_pseudo8(Optional myval As Byte)
    If IsNumeric(myval) And (myval <> 0) Then rnd_PR8 = myval
    carry = ShiftRight(rnd_PR8)
    If carry Then rnd_PR8 = rnd_PR8 Xor 184 '0b8h
    rnd_pseudo8 = rnd_PR8
End Function

Public Function rnd_pseudo16(Optional myval As Integer)
    If IsNumeric(myval) And (myval <> 0) Then rnd_PR16 = myval
    carry = ShiftRight(rnd_PR16)
    If carry Then rnd_PR16 = rnd_PR16 Xor Int(46080) '0b400h
    rnd_pseudo16 = rnd_PR16
End Function

Private Function ShiftRight(ByRef myval) As Boolean
    Dim result As Variant
    result = myval / 2
    myval = Int(result)
    If Int(result) <> result Then ShiftRight = True Else ShiftRight = False
End Function

maxhamner aht hotmail daught com

APIs are not an ADD-ON to VB, they are its FOUNDATION.

I Can't Stop Repeating, Repeating,repeating,repeating,repea . . .
I have a function which adds together three integers from an array in a loop. It tests for TRUE and puts the result in another array. Thus: A+B+C=X.
I would like to filter same results, for example if we want X=10 then 5+2+3=10 or 5+1+4=10 but there is no need to repeat 2+3+5=10.

Here's what I got so far:

Private Function Combine(Values, TargetValue) As String()

Dim arr1, arr2, arr3
arr1 = rArray
arr2 = rArray
arr3 = rArray
Dim i As Integer, j As Integer, k As Integer
Dim arr() As String
For i = 0 To UBound(arr1)
For j = 0 To UBound(arr2)
For k = 0 To UBound(arr3)
If arr1(i) + arr2(j) + arr3(k) = intVal Then
arr = AddToArray(arr, arr1(i) & " + " & arr2(j) & " + " & arr3(k) & " = " & intVal)
End If
Next k
Next j
Next i
Combine = arr

End Function
'Then to read the contents:

Private Sub cmdRes3_Click()

On Error Resume Next
intVal = txtVal.Text
Dim arr() As String
Dim i As Integer
arr = Combine(rArray, 10)
txtAns = "" 'clear textbox
For i = 0 To UBound(arr) - 1
'Debug.Print arr(i)
txtAns = txtAns & arr(i) & vbCrLf
Next 'multi dimensional

NoGood_click ' combination error

End Sub

Obviously I left out a lot of code but I had wanted to show the general idea.

The Random Function Gets The Same Random Numbers Every Time I Start The Program
I'm making a Poker program

The code is like:
Command1_click sub()
Card1.caption = int(rnd()*53) +1
Card2.caption = int(rnd()*53) +1
Card3.caption = int(rnd()*53) +1
Card4.caption = int(rnd()*53) +1
Card5.caption = int(rnd()*53) +1
End sub
( I use much more codes of course)

When I click the command1 button, I get the numbers random, but I get the same random numbers in the same order every time I start the game.

I start the game:
I click command1: card1= 9, card2= 18, card3= 42, card4= 23, card5= 4
I click command1 again: card1= 7, card2= 51, card3= 13, card4= 29, card5= 14
and so on, random every time I click...

I start the game again, another time:
I click command1: card1= 9, card2= 18, card3= 42, card4= 23, card5= 4
I click command1 again: card1= 7, card2= 51, card3= 13, card4= 29, card5= 14
and so on, random every time I click. But I get the same numbers, In the same order.

I hope I've explained my problem well.
Please, help.... =(

Random Generate

I'm tryin to write a little program that generates names i have got 2 .txt files the 1st contains first names 2nd contains surnames, i want the program 2 take random first names and merge them with random surnames and export the results into another txt file, is this possible can any1 help me out ?

Thanks in Advance

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hi guys.
im creating a random number for an id in ADO.
i tried it in DAO and it worked well. but my project now isa ADO.

how can i convert this code to ADO?

thanks in advance!



Function GenerateNum() As String
Set rsCustomer = dbSSS.OpenRecordset("Customer")
Dim strNum As String
Dim vlRndNum As Long

vlRndNum = Int(Rnd * (999 - 1111 + 1)) + 1111
strNum = Format(Date, "YY") + "-" + Trim$(Str(vlRndNum))

rsCustomer.Index = "CustomerID"
rsCustomer.Seek "=", strNum

Loop Until rsCustomer.NoMatch
GenerateNumComp = strNum
txtNewCustomer.Text = GenerateNumComp

End Function


is this possible? in ADO?
thanks guys!


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Anyone know how to generate a random key using all capital letters and numbers? Something like this:


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Generate Numbers
hallo all. my problem is ....
i created one application for generating random numbers and using a one module for generating from vb page with code.. so..
i created a textbox named txtbox3 and txtbox1 for input user defined number for start and stop generating numbers.
everytime a program generating numbers starts from " 1 " to user defined number.
where is a problem but no start generating from textbox input number.
i gave a sample code of program.

interface having a
one listbox named text2
two textboxes named text1 and text3
one button named Command1

code of Form1.vb

Dim sequence() As Integer

Private Sub Command1_Click()
Text2 = ""
If Not (IsNumeric(text3.Text)) Then
MsgBox ("Pleace Enter a number")
Exit Sub
End If
If Val(text3) = 0 Then Exit Sub
ReDim sequence(Val(text3.Text))
If (getnewsequence(sequence, Val(text3.Text))) Then
'Debug.Print " sequence generated OK"
'Debug.Print " sequence NOT generated "
End If
Dim Text1 As Integer
For Text1 = Text1 To Val(text3.Text)
Text2.AddItem (Text2 & sequence(Text1))
End Sub

Private Sub Form_Load()
Text1 = Text1.Text
End Sub

code of module ... module named a " modrndnumgen "

Dim uniqueseq() As Integer
Dim numberofnumbers As Integer
Public Function getnewsequence(sequence() As Integer, number As Integer) As Boolean
On Error GoTo error
ReDim sequence(number)
Dim Text1, newnum As Integer
numberofnumbers = number
ReDim shufseq(numberofnumbers + 1)
ReDim uniqueseq(numberofnumbers + 1)
newnum = Randomgen
uniqueseq(1) = newnum
sequence(1) = newnum
For Text1 = 2 To numberofnumbers
newnum = Randomgen
Loop Until ((checkifexists(newnum)) = True)
uniqueseq(Text1) = newnum
sequence(Text1) = newnum
getnewsequence = True
Exit Function
getnewsequence = False
End Function

Private Function Randomgen() As Integer
On Error Resume Next
Randomgen = Int((numberofnumbers + 1) * Rnd)
Loop Until Randomgen <> 0
End Function
Private Function checkifexists(number As Integer) As Boolean
On Error Resume Next
Dim Text1 As Integer
For Text1 = 1 To numberofnumbers + 1
If number = uniqueseq(Text1) Then
checkifexists = False
Exit Function
End If
Next Text1
checkifexists = True
End Function

i dont no where is a problem may be a
numberofnumbers = 0
to starts from 0 generate
i try to change it and gives me errors

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Option Explicit

Private Sub cmdDone_Click()
Unload Me
End Sub

Private Sub Form_Load()

Call FillArray
Call DisplayArray

End Sub

Sub FillArray()
Dim intNumbers As Integer
Dim intGenerate As Integer
intGenerate = intNumbers + 1
For intNumbers = 1 To 100
lstOutcome.AddItem intNumbers & vbTab & intGenerate
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lstMessage.AddItem "Index" & vbTab & "Generated Number"
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lstOutcome.AddItem intNumbers
End Sub

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' the mask must contain the following special chars
' ? : any ASCII character (1-127)
' # : a digit
' A : an alphabetic char
' N : an alphanumeric char
' H : an hex char
' all other chars are taken literally

' Example: a random-generated phone number
' phone = RandomString("(###)-####-####")

Can someone please give me the right code to do this.
I want to use it in a normal textbox.

many thanks to the one who give me the right solution for my problem


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...between 60 & 120?

dim i as long
i = Rnd * 10

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Random Num - Dont Generate Same Num
Hi all,

I'm experimenting with a small VB game and generating a random number with the function:

Public Function Rand(ByVal Low As Long, ByVal High As Long) As Long
Randomize 'initialize the seed
Rand = Int(High * Rnd + Low)
End Function

And doing the following: boxElement = Rand(0,21)

However, I do not want to generate the same number twice. Can someone please point me in the right direction as to how to do this?

Thanks, Percy

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Can you generate random words, and if so how

How Do I Generate A Random Number
i would like to generate a random number when a cmd is selected
but i want it so it only picks a number say between 1-20

how would i do that?

Hello All How Do I Generate Random Operators..
The application is a math tutor... with 2 numbers just generating randomly numbers between 1-10 and then there's a label box in between these two numbers which will be the operators... e.g +, - , / , *
So when i run the application it'll show
for example..

1 X 4 =
2 - 5 =
1 + 9 =
3 / 9 =
the hint tells me to... (hint: generate random numbers to represent the operators). This is what I got so far but it seems to still not generate random operators please help.

Option Explicit
Private intOne As Integer
Private intTwo As Integer
Private intOperator As Integer

Private Sub cmdDone_Click()
Unload Me
End Sub

Private Sub Form_Load()
intOne = Int(10 * Rnd + 1)
intTwo = Int(10 * Rnd + 1)
intOperator = Int(4 * Rnd + 1)
If intOperator = "4" Then
lblOperator.Caption = "+"
ElseIf intOperator = "3" Then
lblOperator.Caption = "-"
ElseIf intOperator = "2" Then
lblOperator.Caption = "*"
ElseIf intOperator = "1" Then
lblOperator.Caption = "/"
End If
lblOne.Caption = intOne
lblTwo.Caption = intTwo
lblOperator.Caption = intOperator

End Sub

Generate Random # Within Given Range
Good Morning,

I am currently using VB6 with SP6 and I am trying to generate a random number between a user defined range. I know this is possible but cannot recall how it is done. Could anyone please help? Here is the code that I am trying.

p = Timer

Label3.Caption = Str(p)
Result = CLng((Int(Hi * Rnd(p))) + Lo)

All variables are defined as long. The p variable is just used so that I can see the RND seed that will be used just to make sure that it is getting some number other than 0. The Hi and Lo variables are the variables used to contain the user defined range for the random # to be generated.

For example if Lo=50 and Hi=75 then the random number generated would be greater than or equal to 50 AND less than or equal to 75. But when I run the program I get numbers that are greater than 75.

Thank you all for your time and effort in this problem.

Have a great day
God Bless

Generate A Random Password

What would be the easiest way to make a VB app generate a random password that contained numbers and letters (upper and lower case) of say 10 characters in length?



How To Generate A Random Number??
Lets say I want a number between 1 & 10.
I tried this code, but it's not working...

VB Code:
Private Sub cmdGenerate_Click(Level As Byte)   MsgBox i((10 - 1 + 1) * Rnd + 1)End Sub

Generate Random Filename
hi friends, how to generate random filenames. i mean some random text that i can use as filenames. or some function that will return random character such as rnd generates random number


Generate A Random Integer
Hello I am trying to remember how to set it to generate a random integer in a variable. the best way to explain what I am trying to learn is Say you want to when you click on a command button you want it to set strVal to a number between 1 and 6 (sorta like rollin a dice) for a game a chance type thing.

I thought it would be

VB Code:
strVal =Rnd(1 - 6)

but could not get it to work.

Generate Random Number?

How would I generate a random 4 digit number, without ever encountering the same of a single digit? For example, I wouldn't ever want to generate 0000 or 1111 or 2222... I think you get the point.



How Do I Generate A Random Number
Hi, I'm trying to generate a number. I need the number to be divisible by 100 eg. 100,200,300 etc. I have no idea how to generate any kind of number in vb. Thanks

How Can I Generate Random Pictures?
i am currently working a game. i draw out imageboxes named "imgControl" (using index property) in a form.
my problem is how can i generate random picked pictures that are stored in a folder and display them in the imgControl during run-time? (by the way the random pictures must be picked up twice) e.g: picA picA, picD, picD.

How Does VB Generate A Random Number?
How does VB generate a random number... ive been thinking and i cant see how a machine can get a truely random number... any ideas?

How Do I Generate A Random Password
I am working on VB type form that will simply have a label and a Command button.

All I want the button to do is run a code that will generate a random password that is 7 characters in length with 1 or 2 numbers and the rest being lowercase letters. I want the code to write to the label. I don't want to store or send the password to anyone.... just generate it so I can use it later if need be. This form will be inside an Access database we use for tracking these passwords.

This is the code I have right now, but as I am new to vb coding, I am not sure how to make it work....


' /* In A Code Module Add This: */

Public Function Gen_Rand_Password(PassLength As Integer) As String
' /* Dimension A Variable To Contain The Random Password */
Dim RetVal As String

' /* Dimension Variables To Contain The Upper and Lower Random Boundaries */
Dim Max As Integer
Dim Min As Integer

' /* Set The Limits Of Min and Max To Character Codes Relevant To The Keyboard */
Max = 126
Min = 48

' /* Set The Random Number Generator, Using Timer as the Seed */
' /* This Makes The Psuedo-Random Number A Little More Random */
Randomize Timer

' /* You Can Change This To The Desired Length, 8 is Pretty Much A */
' /* Standard Password Length */
If PassLength < 8 Then
' /* Return From Function With An Error */
Gen_Rand_Password = "error: invalid length"
End If

' /* Loop Until We Reach The Desired Length Of The Password */
For I = 1 To PassLength
' /* Concantenate (append) RetVal with Random Keyboard Character */
RetVal = RetVal & Chr(Int((Max - Min + 1) * Rnd + Min))
Next I

' /* Return That Value To The Calling Procedure */
Gen_Rand_Password = RetVal
End Function

' /* In Your Form (or In Another Procedure) [Call It Like This] */
' /* The Value Passed To The Function (8, In This Case) */
' /* Is The Number Characters That Will Be Returned */
RandomPassword = Gen_Rand_Password(8)

Can someone please give me an idea of what I am doing

Generate Random Four Fix Digits
Hi pros,

How can i do a random number to generate with fix four digits from 0 to 9999.

I use:

Dim MyValue As String
MyValue = Int((9999 * Rnd)) ' Generate random value between 0 and 9999.
lblnumbers.Caption = MyValue

It does generate numbers but at times 1,2 or 3 digits.I would like a fix four digits.

Thank you very much.

Yahoo! Biztools
- Promote your business from just $5 a month!

How To Generate Random Values In VB(help!)
hello All!

I am asked to fill up a table with values not manually but programmatically.
There are 4 fields in the said table and one of the fields are supposed to contain random values.

Q: How are random values generated in VB?

and one set of these random values are supposed to follow a 35-digit length,meaning, if the generated value is less than 35, I have to prefix it with xxx to attain the 35 digit length.

I hope somebody can help. I am new to this so pardon me for my query.

How To Generate Random Number
How i can generate random number using VB6.

Please help.Thanks

How To Generate A Random Number
Hi, everyone,
How to generate a random number from a given list? Thank you

How Can I Generate Random Pictures?
i am currently working a game. i draw out imageboxes named "imgControl" (using index property) in a form.
my problem is how can i generate random picked pictures that are stored in a folder and display them in the imgControl? (by the way the random pictures must be picked up twice) e.g: picA picA, picD, picD.

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