VB.NET中随机产生十个数字

添加listbox1,label1,command1

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Public Class Form1

Dim N(10) As Integer

'生成随机数

Private Sub CreatRand()

Dim I As Integer

Dim Strarr As String

Strarr = ""

ListBox1.Items.Clear()

Dim R As New System.Random

For I = 0 To 9

N(I) = R.Next(30, 100)

ListBox1.Items.Add(Str(N(I)))

Strarr = Strarr Str(N(I)) " "

Next

'添加标签的横向数字序列

Label1.Text = Strarr

End Sub

'获取最大值

Private Function GetMax() As Integer

Dim I As Integer

Dim intMax As Integer

intMax = 0

For I = 0 To 9

intMax = IIf(intMax N(I), intMax, N(I))

Next

Return intMax

End Function

'获取最小值

Private Function GetMin() As Integer

Dim I As Integer

Dim intMin As Integer

intMin = 101

For I = 0 To 9

intMin = IIf(intMin N(I), intMin, N(I))

Next

Return intMin

End Function

'获取平均值

Private Function GetAve() As Single

Dim I As Integer

Dim Sum As Integer

Sum = 0

For I = 0 To 9

Sum = Sum + N(I)

Next

Return Sum / 10

End Function

'生成随机数，显示各种值

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Call CreatRand()

MsgBox("最大值=" Str(GetMax()) ",最小值=" Str(GetMin()) ",平均值=" Str(GetAve()))

End Sub

End Class

VB.NET ，文本框限制输入数字个数。例如不低于5位数而不大于11位数。违反则有提示。

input type="text" maxlength="11" /这是控制最大输入字数至于不能少于11个字，需要在点击保存按钮时，通过.length来控制

vb.net.问题：通过文本框输入一串字符，单击命令按钮，要求分别统计字符串中所含字母和数字的个数。

要改成这样；

for i = 1 to Len(s)

j = Mid(s,i,1)

select case j

case "a" to "z","A" to "Z"

C = C + 1

CASE "0" TO "9"

D = D + 1

CASE ELSE

M= M+1

END SELECT

NEXT

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