XL2000: How to Create Unique Random Integers Between Two Numbers (213290)

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1. Start Excel, and then Press ALT+F11 to start the Visual Basic editor.
2. On the Insert menu, click Module.
3. Type the following code in a module sheet:

   Option Explicit
   
   Sub Unique_Numbers()
      Dim x As Long, y As Long, z As Long, tempnum As Long
      Dim flag As Boolean
      Dim i As Integer
      Dim foundCell As Range
      Application.ScreenUpdating = False
      x = Application.InputBox("Enter starting Random Number" _
         , "Random Number Generation", 1, , , , , 1)
      y = Application.InputBox("Enter ending Random Number" _
         , "Random Number Generation", 1000, , , , , 1)
      z = Application.InputBox("How many random numbers would" _
         & "you like to generate (<15000)?" _
             , "Random Number Generation", 100, , , , , 1)
      If z = 0 Then Exit Sub
      If z > 15000 Then z = 15000
      If z > y - x + 1 Then
          MsgBox "You specified more numbers to return than " _
            & "are possible in the range!"
          Exit Sub
      End If
      Randomize
      Cells(1, 1) =  Int((y - x + 1) * Rnd + x)
      For i = 2 To z
          Do
              flag = False
              Randomize
              tempnum = Int((y - x + 1) * Rnd + x)
              Set foundCell = Range("a1", _
                     Range("a1").End(xlDown).Address).Find(tempnum)
              If Not (foundCell Is Nothing) Then
                  flag = True
              End If
          Loop Until Not flag
          Cells(i, 1) =  tempnum
      Next
   End Sub         
   						

4. Press ALT+F11 to return to Excel.
5. On the Tools menu, point to Macro, and then click Macros.
6. In the Macro name list, click Unique_Numbers, and then click Run.