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
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
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
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!")