vb.net给字符排序 vb中排序

vb.net的随机3个数字，然后排序一下

给你一个最简单的冒泡排序代码：

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将三个数放到一个数组中。

a(0)=val(text1.text):a(1)=val(text2.text):a(2)=val(text3.text)

dim flag as Boolean,temp as Integer

for i = 0 to 2

flag = true

for j = 2 to 1

if a(j)a(j-1) then

temp = a(j-1)

a(j-1) = a(j)

a(j) = temp

flag = false

end if

next j

if flag then Exit For

next i

text4.text=a(0):text5.text=a(1):text6.text=a(2)

VB 字符串排序

Option Explicit

Private Sub Command1_Click() '排序

Dim i%, j%, S() As String, t As String

ReDim S(Len(Trim(Text1)))

For i = LBound(S) To UBound(S)

S(i) = Mid(Trim(Text1), i + 1, 1)

Next

For i = 0 To UBound(S)

For j = i + 1 To UBound(S)

If S(j) S(i) Then t = S(i): S(i) = S(j): S(j) = t

Next

Text2 = Text2 S(i)

Text2 = Trim(Text2)

Next

End Sub

Private Sub Command2_Click() '读入

Dim Txt As String

Open App.Path "\test12.txt" For Input As #11

Do While Not EOF(11)

Line Input #11, Txt

Text1 = Text1 Txt

Loop

Close #11

End Sub

Private Sub Command3_Click() '追加

Open App.Path "\test12.txt" For Append As #12

Print #12, Text2

Close #12

End Sub

vb.net 排列组合 代码

第一题:

不需要任何控件,代码如下:

Private Sub Form_Click()

Dim A() As Integer, N As Integer

Dim St As String, I As Integer, J As Integer

Randomize

Do

St = InputBox("数字的个数", "输入", Int(Rnd * 100))

If St = "" Then

MsgBox "请输入数字!"

Else

N = Int(Val(St))

If N 1 Then

MsgBox "请输入大于0的数字!"

Else

Exit Do

End If

End If

Loop

ReDim A(N)

For I = 1 To N

Do

St = InputBox("第" + Str(I) + "个数字", "输入", Int(Rnd * 100))

If St = "" Then

MsgBox "请输入数字!"

Else

A(I) = Int(Val(St))

Exit Do

End If

Loop

Next

For I = 1 To N - 1

For J = I + 1 To N

If A(I) A(J) Then

A(0) = A(I)

A(I) = A(J)

A(J) = A(0)

End If

Next

Next

For I = 1 To N

Open App.Path "\" Trim(Str(I)) ".txt" For Output As #1

Print #1, A(I)

Close #1

Next

Print "已经把"; N; "个数写入到"; App.Path; "\1.txt 到 "; N; ".txt中.请查看."

End Sub

'已经运行过.

第二题:

DIM 是变量声明语句,它的格式为:

dim 变量名[as 格式] [,变量名[as 格式][,变量名[as 格式]......]

其中:

变量名:以字母或汉字开始的字串,代表一个变量

格式有以下几种:

属于数字的有五种:

(1)字节型:byte可取值0-255

(2)整形:integer可取值-32768至32767

(3)长整形:long(可取值范围很大的正负整数)

(4)单精度型:single(可取值小数)

(5)双精度型:double(可取值范围更大,小数位数更多的小数)

字符串型:string(可代表由字母\数字或汉字组成的字符集合)

布尔型:boolean(取值为ture\false)

日期型:date(可表示形如2009-5-26 02:36这样的组合)

如果要用姓名\住址\单位名称...等用字符串型(string)

eg:dim name as string(用name变量表示名字时,声明成字符串变量)

如果是用数字需要做计算,如工资\合计\人数....等要用数字型,但有一个原则,优先选用范围小的(按照字节型(byte)\整形(integer)\长整形(long)\单精度型(single)\双精度型(double)的顺序选择),够用就可以了,这样可以占用内存少,运算速度快.

eg:dim count as integer(用integer表示员工人数时,可声明成整形变量)

eg:dim sum as single(用sum表示工资时,可声明成单精度型变量)

不知是否说得清楚了.

VB怎么使一个字符串按要求排序？就是字符串里面有数字和字母。先按字母在前。数字在后面。字母和数字也

什么都不说，先上效果图——

编码——

Private Sub Command1_Click()

Dim s1 As String, s_num As String, a As String

Dim lennum As Integer, lenuchar As Integer, lenlchar As Integer

Dim s_lchar As String, s_uchar As String

Dim i As Integer, length As Integer, value As Integer

s1 = Text1.Text

s_num = ""         '用来存放数字的字符串变量

s_uchar = ""        '用来存放大写字母的字符串变量

s_lchar = ""        '用来存放小写字母的字符串变量

length = Len(s1)

For i = 1 To length

a = Mid(s1, i, 1)

value = Asc(a)

Text2.Text = value

If value = 48 And value = 57 Then s_num = s_num a

If value = 65 And value = 90 Then s_uchar = s_uchar a

If value = 97 And value = 122 Then s_lchar = s_lchar a

Next i

' 把字符串中的各种字符分类成 数字类，大写字母，小写字母

lennum = Len(s_num)

lenuchar = Len(s_uchar)

lenlchar = Len(s_lchar)

Dim sz() As Integer    '定义动态数组

Dim temp As Integer

ReDim sz(1 To lennum) As Integer   '定义数组供 数字的ASCII码

For i = 1 To lennum

a = Mid(s_num, i, 1)

sz(i) = Asc(a)

Next i

For i = lennum To 1 Step -1         '最常用的冒泡排序法

For j = 1 To i - 1

  If sz(j) sz(j + 1) Then temp = sz(j): sz(j) = sz(j + 1): sz(j + 1) = temp

Next j

Next i

s_num = ""              '清空s_num ，因为要重新排列了

For i = 1 To lennum

s_num = s_num Chr(sz(i))

Next i

ReDim sz(1 To lenuchar) As Integer  '重新定义数组供 大写字母的ASCII码，接下来程序思路与上面类似

For i = 1 To lenuchar

a = Mid(s_uchar, i, 1)

sz(i) = Asc(a)

Next i

For i = lenuchar To 1 Step -1

For j = 1 To i - 1

  If sz(j) sz(j + 1) Then temp = sz(j): sz(j) = sz(j + 1): sz(j + 1) = temp

Next j

Next i

s_uchar = ""

For i = 1 To lenuchar

s_uchar = s_uchar Chr(sz(i))

Next i

ReDim sz(1 To lenlchar) As Integer  '重新定义数组供 小写字母的ASCII码，接下来程序思路与上面类似

For i = 1 To lenlchar

a = Mid(s_lchar, i, 1)

sz(i) = Asc(a)

Next i

For i = lenlchar To 1 Step -1

For j = 1 To i - 1

  If sz(j) sz(j + 1) Then temp = sz(j): sz(j) = sz(j + 1): sz(j + 1) = temp

Next j

Next i

s_lchar = ""

For i = 1 To lenlchar

s_lchar = s_lchar Chr(sz(i))

Next i

Text2.Text = s_uchar s_lchar s_num

End Sub

该程序主要运用了Asc()函数获得ASCII码来分辨字母与数字，用 动态数组和重定义来多次运用数组进行排序（冒泡排序法）和赋值操作，用chr()函数还原字符串。

我的程序有点略长，中间有少许重复部分，但我觉得思路比较清晰易懂，适合初学者。你也可以试着自己改进。

VB.net 排序

你这个是冒泡排序么？从大到小么？

For j = 0 To lstNetworkRisk.Items.Count - 1 应该改成

For j = i To lstNetworkRisk.Items.Count - 1

另外尽量不要用GOTO语句。而且完全也可以不用这个GOTO。

还有不知道你用的什么版本的.net 如果是3.5的完全可以直接用linq。