A Non-Repeating Random Number Generator

Posted: 2002-06-01
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With this simple, and very fast, routine you can generate a series of non-repeating random numbers. You can select a series of 10 numbers, or a series of a million...It doesn't matter. Can be useful for image fades, deck shuffling, random tip of the day, etc. - It even tells you how long it took to generate the series.

Original Author: Kevin Lawrence

Returns

A popup message stating how many numbers had been mixed up and how long it took.

Side Effects

The larger the series of numbers the more RAM required. Uses arrays.

API Declarations

Code

Private Sub Command1_Click() '------------------------------------------------------------- ' Produces a series of X random numbers without repeating any '------------------------------------------------------------- 'Results can be used by using array B(X) Dim A(10000) ' Sets the maximum number to pick Dim B(10000) ' Will be the list of new numbers (same as DIM above) Dim Message, Message_Style, Message_Title, Response 'Set the original array MaxNumber = 10000 ' Must equal the DIM above For seq = 0 To MaxNumber A(seq) = seq Next seq 'Main Loop (mix em all up) StartTime = Timer Randomize (Timer) For MainLoop = MaxNumber To 0 Step -1 ChosenNumber = Int(MainLoop * Rnd) B(MaxNumber - MainLoop) = A(ChosenNumber) A(ChosenNumber) = A(MainLoop) Next MainLoop EndTime = Timer TotalTime = EndTime - StartTime Message = "The sequence of " + Format(MaxNumber, "#,###,###,###") + " numbers has been" + Chr$(10) Message = Message + "mixed up in a total of " + Format(TotalTime, "##.######") + " seconds!" Message_Style = vbInformationOnly + vbInformation + vbDefaultButton2 Message_Title = "Sequence Generated" Response = MsgBox(Message, Message_Style, Message_Title) End Sub

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