vb点虐 次数 vbnet randomize

vb点虐 如何实现输出一串字符串中的所有字符以及每个字符的出现次数？

使用一个单重的循环扫描这个字符串中的所有字符，对每一个字符的出现次数进行统计，最后输出每个字符的出现次数。

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Private Sub Command1_Click()

s = InputBox("请输入一个英文字符串：")

Dim a(128) As Integer

For i = 1 To Len(s)

t = Asc(Mid(s, i, 1))

a(t) = a(t) + 1

Next i

For i = 1 To 127

If a(i) 0 Then Print Chr(i); ":"; a(i)

Next i

End Sub

VB.NET的题目哈 随机产生20个大写字母，求出现次数最多的字母及出现次数，还有求出现次数为0的字母有哪些

Imports System.Text.RegularExpressions

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim a As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

Dim g() As Char = a.ToCharArray

Dim MyRandom As New Random

Dim bs As String = ""

For i = 1 To 20

bs = g(MyRandom.Next(0, g.GetUpperBound(0) + 1))

Next

Dim gs() As String = (From mt As Match In Regex.Matches(bs, "[A-Z]") Select mt.Value).ToArray

System.Array.Sort(gs)

gs = (From mt As Match In Regex.Matches(Join(gs, ""), "([A-Z])\1*") Select mt.Value).ToArray

Dim g_len() As Integer

g_len = (From mt As Match In Regex.Matches(Join(gs, ""), "([A-Z])\1*") Select mt.Length).ToArray ' 使用数组元素作为计数器g_len

System.Array.Sort(g_len, gs)

Label1.Text = "出现次数最多的字母：" gs(gs.GetUpperBound(0)).Substring(0, 1) " 共出现" g_len(g_len.GetUpperBound(0)) "次" vbCrLf "没有出现的字母是：" Join(a.Split(bs.ToCharArray), "")

End Sub

End Class

vb点虐 中怎么获取button被点击的次数

定义一个全局的静态变量，例如

Dim Shared c As Integer

在 button 的 click 时间里写入 c = c + 1

这个 c 就是 点击次数了

vb点虐 中求字符串2在字符串1中出现的所有位置以及出现次数

Dim str1 As String = "112113114111"

Dim str2 As String = "11"

Dim count As Integer = 0

For i As Integer = 0 To str1.Length - 1

Dim f As Integer = str1.IndexOf(str2, i)

If f -1 Then

MsgBox("str2出现在str1的" f "个字符位置")

i = f

count += 1

End If

Next

MsgBox("统计出str1中共有" count "个str2！")