Re: [VB6 ] 關於取亂數不重複
剛才依照幾位板友的建議，試著用了我沒用過的寫法來寫49選6的亂數值
先把49個數字放在一個暫存的陣列中，再抽出6個數字
(以前我都只會用迴圈去找有沒有重覆，效能很差，還有可能會無窮迴圈)
Public Sub Main()
Randomize Timer
'設定最小值及最大值
Const min As Integer = 1, max As Integer = 49
'設定要取得亂數的數量
Const count As Integer = 6
Dim number() As Integer
number = GetRndNumber(min, max, count)
Dim i As Integer
For i = 0 To count - 1
Debug.Print number(i) & " ";
Next
Debug.Print
End Sub
'取得亂數
Public Function GetRndNumber(ByVal min As Integer, ByVal max As Integer, ByVal count As Integer) As Integer()
'計算陣列上限
Dim u As Integer
u = max - min
ReDim buffer(u) As Integer, result(count - 1) As Integer
Dim i As Integer, n As Integer
'將 min 至 max 範圍的數字依序填入 buffer 陣列中
n = min
For i = 0 To u
buffer(i) = n
If i < u Then n = n + 1
Next
For i = 0 To count - 1
n = CInt(Rnd * u)
result(i) = buffer(n)
Swap buffer(n), buffer(u)
u = u - 1
Next
'回傳結果
GetRndNumber = result
End Function
'變數交換
Public Sub Swap(ByRef v1 As Variant, ByRef v2 As Variant)
Dim tmp As Variant
tmp = v2
v2 = v1
v1 = tmp
End Sub
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