育才学习网1. vb代码怎么写
首先在Combo1的List属性中加入"a","b","c"
Combo1.click事件中加入代码：
ID = Combo1.List(Combo1.ListIndex())
Select Case ID
Case "a"
Text1.Text = "111"
Case "b"
Text1.Text = "222"
Case "c"
Text1.Text = "333"
Case Else
End Select
2. VB添加代码怎么写
insert into card_user（字段1，字段2,。..）value('"& text1.text &"','"& text2.text &"')
这句代码是把text1内容作为字段1添加到表card_user
不知道你用的什么库和数据库表的结构. 如果Private Sub XPButton3_Click（)作为添加事件的话. 结构应该是这样，具体代码你自己加 Private Sub XPButton3_Click（) 打开数据库连接 打开数据库表 数据库表添加（insert into card_user（字段1，字段2,。..）value('"& text1.text &"','"& text2.text &"'，。..)） 关闭数据库表 关闭数据库连接 End Sub
3. 这个vb代码怎样写
楼上2位，题目要求是直到前后两项之差小于10^(-5)为止，而不是输入n的值来求。
Private Sub Command1_Click()
Dim i As Integer
Dim f As Double
Dim e As Double
i = 1
f = 1
e = 2
Do
i = i + 1
f = f / i
e = e + f
Loop While (f * i - f) >= 10 ^ -5
Print e
End Sub
4. 关于vb的程序代码怎么写
'能产生霓虹灯效果的代码'在窗体上添加控件 Picture1、Timer1'在窗体上添加控件 Shape1，并在属性窗口设置 Shape1 的属性 Name=Sha , Index=0'在窗体上添加控件 Combo1，并在属性窗口设置 Combo1 的属性 Name=Comb , Index=0'将以下代码添加到窗体代码中 Dim ctP As Single, ctLei As Long, ctX0 As Single, ctY0 As Single, ctSize As Single Dim ctRefresh As Boolean, ctA As Single, ctB As Single, ctX1 As Single, ctY1 As Single Private Sub Form_Load() Dim I As Long, K As Long Me.Caption = "闪光函数" Set Sha(0).Container = Picture1 Sha(0).Visible = False: Timer1.Enabled = False Picture1.AutoRedraw = True For I = 1 To 3 Load Comb(I): Comb(I).Visible = True Next K = 0 For I = 0 To 19 If I < 10 Then Comb(K).AddItem I & " 个光点" Else Comb(K).AddItem (I - 9) * 10 & " 个光点" Next Comb(K).ListIndex = 10 K = 1 Comb(K).List(0) = "圆" Comb(K).List(1) = "椭圆" Comb(K).List(2) = "正弦" Comb(K).ListIndex = 1 K = 2 For I = 0 To 29 If I < 10 Then Comb(K).AddItem I & " 变速" Else Comb(K).AddItem (I - 9) * 10 & " 变速" Next Comb(K).ListIndex = 15 K = 3 For I = 0 To 9 Comb(K).AddItem I & " 线宽" Next Comb(K).ListIndex = 1 ctRefresh = True Call StartFlash End Sub Private Sub Form_Resize() Dim I As Long, L As Single, T As Single, W As Long, H As Long, Jg As Single Jg = Comb(0).Height * 0.2 T = Jg L = Jg For I = 0 To Comb.Count - 1 Comb(I).Move L, T L = L + Comb(I).Width + Jg Next T = Comb(0).Top + Comb(0).Height + Jg W = Me.ScaleWidth: H = Me.ScaleHeight - T Picture1.Move 0, T, W, H Call SetXY0 End Sub Private Sub SetXY0() ctA = Picture1.ScaleHeight * 0.4 '短轴 ctB = Picture1.ScaleWidth * 0.4 '长轴 Select Case ctLei Case 0, 1 '圆，椭圆 ctX0 = Picture1.ScaleWidth * 0.5 - ctSize: ctY0 = Picture1.ScaleHeight * 0.5 - ctSize Case 2 '正弦 ctX0 = Picture1.ScaleWidth * 0.05 - ctSize: ctY0 = Picture1.ScaleHeight * 0.5 - ctSize ctB = ctB * 1.1 End Select End Sub Private Sub Comb_Change(Index As Integer) Call StartFlash End Sub Private Sub Comb_Click(Index As Integer) Call StartFlash End Sub Private Sub StartFlash() Dim I As Long If Not ctRefresh Then Exit Sub ctLei = Comb(1).ListIndex '函数类型 ctP = 3.1415926 '圆周率 ctY1 = Val(Comb(2).Text） '短轴变换率（半径，位置等） ctX1 = ctY1 I = Val(Comb(3).Text) If I < 1 Then I = 1 If I > 9 Then I = 9 Picture1.DrawWidth = I If I < 5 Then I = 5 ctSize = I * 15 '60 '光点大小 Sha(0).FillColor = 255 '&HFFFFFF Call SetXY0 Timer1.Tag = "1" Timer1.Interval = 25 Timer1.Enabled = True End Sub Private Sub Timer1_Timer() Static n As Single, Ci As Long Dim X As Single, Y As Single, S As Single If Timer1.Tag <> "" Then Call LoadSha ctA = ctA + ctY1 If ctA > ctY0 Then ctY1 = -Abs(ctY1) If ctA <= 0 Then ctY1 = Abs(ctY1) ctB = ctB + ctX1 If ctLei = 2 Then '正弦 If ctB > Picture1.ScaleWidth * 0.45 Then ctX1 = -Abs(ctX1) Else If ctB > ctX0 Then ctX1 = -Abs(ctX1) End If If ctB <= 0 Then ctX1 = Abs(ctX1) Picture1.Cls If Val(Comb(3).Text) > 0 Then Call GetXY(0, X, Y) Picture1.PSet (X, Y) For S = 0 To ctP * 2 Step ctP / 270 Call GetXY(S, X, Y) Picture1.Line -(X, Y) Next End If n = n + ctP / 90 '180 If n > ctP * 2 Then n = 0 For I = 0 To Sha.Count - 1 S = n + I * ctP * 2 / Sha.Count If S > ctP * 2 Then S = S - ctP * 2 Call GetXY(S, X, Y) Sha(I).Move X - ctSize, Y - ctSize, ctSize * 2, ctSize * 2 Next' Timer1.Tag = "" End Sub Private Sub GetXY(n As Single, X As Single, Y As Single) Select Case ctLei Case 0 '圆 X = ctX0 + ctA * Sin(n) Y = ctY0 + ctA * Cos(n) Case 1 '椭圆 X = ctX0 + ctB * Sin(n) Y = ctY0 + ctA * Cos(n) Case 2 '正弦 X = ctX0 + n * ctB / ctP Y = ctY0 - ctA * Sin(n) End Select End Sub Private Sub LoadSha() Dim I As Long, S As Long Timer1.Tag = "" S = Val(Comb(0).Text) Sha(0).Shape = 3: Sha(0).Move 0, 0, ctSize, ctSize Sha(0).FillStyle = 0 If S > 0 Then Sha(0).Visible = True Else Sha(0).Visible = False For I = Sha.Count - 1 To 1 Step -1 Unload Sha(I) Next For I = 1 To S - 1 '光点数 Load Sha(I): Sha(I).Visible = True Next End Sub。
