vb随机数的一个问题

我编了一个程序：Dim flag As Integer
Dim m(1 To 100) As Integer
Dim i As Integer
Dim p As Integer
Function f(i) As Integer
For p = 1 To i - 1
    If m(i) = m(p) Then m(i) = (Int(Rnd() * c) + b): flag = 1
    If m(i) <> m(p) Then flag = 0
Next p
If flag = 0 Then Print (m(i))
If flag = 1 Then f (i)
End Function
Private Sub Command1_Click()
Dim a As Integer
Dim b As Integer
Dim c As Integer
Dim j As Integer
Randomize
a = InputBox("您想产生几个随机数呢？")
b = InputBox("随机数范围的起点是多少呢？（能取到）")
c = InputBox("随机数范围的终点是多少呢？（能取到）")
For i = 1 To a
    flag = 0
    m(i) = (Int(Rnd() * c) + b)
    f (i)
Next i
End Sub

结果随机时即使规模较小，也会出现溢出提示，而且随机也不对（比如最小为5时会出现0），求高手指教或给出相似程序

这个是我写的,在窗体上添加一个command按钮即可

Private Sub Command1_Click()
Dim i, r(), a, b, c As Integer
a = InputBox("从几开始?", "输入", 0)
b = InputBox("到几?", "输入", a + 1)
c = InputBox("你想产生几个?", "输入", 1)
ReDim r(c)
Randomize
For i = 0 To c - 1
    r(i) = Int(Rnd() * (b - a + 1) + a)
Next
For i = 0 To c - 1
Print r(i)
Next
End Sub