VB实验参考答案.doc

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1、VB.NET程序设计实验参考答案实验1-3Dim n% = 0 Private Sub Form1_Click() Handles Me.Click n = n + 1 TextBox1.Text = nEnd Sub实验1-4Private Sub Form1_Load() Handles MyBase.Load Me.Text = 装入窗体 Me.BackgroundImage = Image.FromFile(tongji.bmp) 当前目录为Bin的Debug Me.Cursor = New Cursor(key04.ico) Me.Icon = New Icon(MISC34.ICO

2、) End Sub Private Sub Form1_Click() Handles MyBase.Click Me.Text = 单击窗体 Me.Size = New Size(264 + 10, 256 + 30) 图片大小为 Me.BackgroundImage = Image.FromFile(tongji-2.bmp) End Sub Private Sub Form1_DoubleClick() Handles MyBase.DoubleClick Me.Text = 双击窗体 Me.MaximizeBox = False Me.MinimizeBox = False Me.Ba

3、ckgroundImage = Nothing Me.Cursor = Cursors.Default End Sub Private Sub Form1_Resize() Handles Me.Resize Me.Size = New Size(264 + 10, 256 + 30) Me.FormBorderStyle = Windows.Forms.FormBorderStyle.Fixed3DEnd Sub实验1-5Private Sub Button1_Click() Handles Button1.Click TextBox1.Font = New Font(隶书, 20) End

4、 Sub Private Sub Button2_Click() Handles Button2.Click TextBox2.Text = TextBox1.SelectedText TextBox2.Font = TextBox1.FontEnd Sub实验1-6Dim w%, h% Private Sub Form1_Load() Handles Me.Load w = PictureBox1.Width h = PictureBox1.Height End Sub Private Sub Button2_Click() Handles Button2.Click PictureBox1

5、.Width = w PictureBox1.Height = h End Sub Private Sub Button1_Click() Handles Button1.Click, Button1.Click PictureBox1.Width = PictureBox1.Width / 2 PictureBox1.Height = PictureBox1.Height / 2End Sub实验2-1Private Sub Button1_Click() Handles Button1.Click TextBox1.Text = Int(Rnd() * 10 + 0) TextBox2.T

6、ext = Int(Rnd() * 90 + 10) TextBox3.Text = Int(Rnd() * (999 - 100 + 1) + 100) End Sub Private Sub Button2_Click() Handles Button2.Click Dim avg! avg = (Val(TextBox1.Text) + Val(TextBox2.Text) + Val(TextBox3.Text) / 3 Label2.Text = 三个数的平均值为： & Format(avg, 0.00) End Sub Private Sub Button3_Click() Han

7、dles Button3.Click EndEnd Sub实验2-4Private Sub Button1_Click() Handles Button1.Click Dim n% n = Val(InputBox(输入个数) Label2.Text = Button1.Text & 函数的结果 TextBox2.Text = StrDup(n, TextBox1.Text) End Sub Private Sub Button2_Click() Handles Button2.Click Label2.Text = Button2.Text & 函数的结果 TextBox2.Text = U

8、Case(TextBox1.Text) End Sub Private Sub Button3_Click() Handles Button3.Click Label2.Text = Button3.Text & 函数的结果 TextBox2.Text = LCase(TextBox1.Text) End Sub Private Sub Button4_Click() Handles Button4.Click Dim n, m As Integer n = Val(InputBox(输入n) m = Val(InputBox(输入m) TextBox2.Text = Mid(TextBox1

9、.Text, n, m) Label2.Text = Button4.Text & 函数的结果 End Sub Private Sub Button5_Click() Handles Button5.Click Label2.Text = Button5.Text & 函数的结果 TextBox2.Text = Len(TextBox1.Text) End Sub Private Sub Button6_Click() Handles Button6.Click Dim s1$ s1 = Val(InputBox(输入s1) TextBox2.Text = InStr(TextBox1.Tex

10、t, s1) Label2.Text = Button6.Text & 函数的结果 End Sub Private Sub Button7_Click() Handles Button7.Click Dim s1$, news$ s1 = InputBox(输入s1) news = InputBox(输入news) TextBox2.Text = Replace(TextBox1.Text, s1, news) Label2.Text = Button7.Text & 函数的结果 End Sub Private Sub Button8_Click() Handles Button8.Click

11、 Label2.Text = Button8.Text & 函数的结果 TextBox2.Text = Trim(TextBox1.Text) End Sub实验2-5Private Sub Button1_Click() Handles Button1.Click Label2.Text = Button1.Text & 函数的结果 TextBox2.Text = Val(TextBox1.Text) End Sub Private Sub Button2_Click() Handles Button2.Click Label2.Text = Button2.Text & 函数的结果 Tex

12、tBox2.Text = Str(TextBox1.Text) End Sub Private Sub Button3_Click() Handles Button3.Click Label2.Text = Button3.Text & 函数的结果 TextBox2.Text = Chr(TextBox1.Text) End Sub Private Sub Button4_Click() Handles Button4.Click TextBox2.Text = Asc(TextBox1.Text) Label2.Text = Button4.Text & 函数的结果 End Sub实验3-2

13、 Private Sub Button1_Click() Handles Button1.Click Dim x!, y!If Not IsNumeric(TextBox1.Text) Then MsgBox(error) TextBox1.Text = TextBox1.Focus() Else x = TextBox1.Text If x 10 Then y = 30 ElseIf x 150 Then y = 150 End If TextBox2.Text = y End Sub 实验3-7Private Sub Button1_Click() Handles Button1.Clic

14、k Dim a#, b#, c#, dt!, s1$, s2$ a = Val(TextBox1.Text) b = Val(TextBox2.Text) c = Val(TextBox3.Text) dt = b 2 - 4 * a * c If dt 0 Then 实根 dt = Math.Sqrt(dt) Label3.Text = Format(-b + dt) / 2 / a, 0.00) Label5.Text = Format(-b - dt) / 2 / a, 0.00) ElseIf dt = 0 Then 重根 dt = Math.Sqrt(dt) Label3.Text

15、= Format(-b / 2 / a, 0.00) Label5.Text = Format(-b / 2 / a, 0.00) Else dt = Math.Sqrt(-dt) 复根 s1 = Format(-b / 2 / a, 0.00) s2 = Format(dt / 2 / a, 0.00) Label3.Text = s1 & + & s2 & i Label5.Text = s1 & - & s2 & i End If End Sub实验3-8If 语句 Dim n%, s$ n = InputBox(输入一个数字7) If n = 1 Then s = 星期一 ElseIf

16、 n = 2 Then s = 星期二 ElseIf n = 3 Then s = 星期三 ElseIf n = 4 Then s = 星期四 ElseIf n = 5 Then s = 星期五 ElseIf n = 6 Then s = 星期六 Else s = 星期日 End If MsgBox(s) Select语句: Select Case n Case 1 s = 星期一 Case 2 s = 星期二 Case 3 s = 星期三 Case 4 s = 星期四 Case 5 s = 星期五 Case 6 s = 星期六 Case 7 s = 星期日 End Select Choose

17、(函数) s = Choose(n, 星期一, 星期二, 星期三, 星期四, 星期五, 星期六, 星期日)实验4-2Private Sub Button1_Click() Handles Button1.Click Dim i%, c$ Label1.Text = For i = 1 To 9 c = StrDup(18 - 2 * i, Chr(i + 64) label1.text &= Space(i) & c & vbCrLf Next iEnd Sub实验4-5Private Sub Button1_Click() Handles Button1.Click 三重循环 Dim i%,

18、 j%, k%, t% Label1.text = For i = 1 To 9 For j = 0 To 9 For k = 0 To 9 t = i * 100 + j * 10 + k If t = i 3 + j 3 + k 3 Then Label1.text &= t & vbCrLf End If Next k Next j Next iEnd Sub或者：Private Sub Button2_Click() Handles Button2.Click 单重循环 Dim i%, j%, k%, t% Label2.Text = For t = 100 To 999 i = t

19、100 j = (t Mod 100) 10 k = t Mod 10 If t = i 3 + j 3 + k 3 Then Label2.Text &= t & vbCrLf End If Next tEnd Sub实验4-7Private Sub Form1_Load() Handles Me.Load HScrollBar1.Maximum = 1 HScrollBar1.Maximum = 9 HScrollBar2.Minimum = 5 HScrollBar1.Maximum = 10 End Sub Private Sub HScrollBar1_Scroll1() Handl

20、es HScrollBar1.Scroll Label1.Text = a= & HScrollBar1.Value End SubPrivate Sub HScrollBar2_Scroll() Handles HScrollBar2.Scroll Dim a, n, i As Integer, sum&, t& Label2.Text = n= & HScrollBar2.Value a = HScrollBar1.Value n = HScrollBar2.Value Label3.Text = sum= & vbCrLf sum = 0 : t = 0 For i = 1 To n t

21、 = t * 10 + a Label3.Text &= Space(15 - Len(Trim(t) & t & vbCrLf sum = sum + t Next Label3.Text &= - & vbCrLf Label3.Text &= Space(15 - Len(Trim(t) & sumEnd Sub实验4-10Dim t% Private Sub TextBox1_KeyPress() Handles TextBox1.KeyPress If Asc(e.KeyChar) = 13 Then ProgressBar1.Minimum = 0 t = Val(TextBox1

22、.Text) * 60 ProgressBar1.Maximum = t ProgressBar1.Value = t Timer1.Interval = 1000 Timer1.Enabled = True End If End Sub Private Sub Timer1_Tick() Handles Timer1.Tick t = t - 1 TextBox1.Text = t 60 & : & Format(t Mod 60, 00) ProgressBar1.Value = t If t = 0 Then Timer1.Enabled = FalseEnd Sub实验4-13Priv

23、ate Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click Dim x%, y%, z%, a, b, c Label1.Text = x y z & vbCrLf For x = 1 To 6 For y = 1 To 6 For z = 5 To 6 If x y And y z Then a = Choose(x, 星期一, 星期二, 星期三, 星期四, 星期五, 星期六) b = Choose(y, 星期一, 星期二, 星期三, 星期四, 星期

24、五, 星期六) c = Choose(z, 星期一, 星期二, 星期三, 星期四, 星期五, 星期六) Label1.Text &= & a & & b & & c & vbCrLf End If Next Next NextEnd Sub实验5-1Private Sub Form1_Click() Handles Me.Click Dim s(9) As Integer, i, Min, Max, Aver s(0) = 30 + Int(Rnd() * 70) Min = s(0) Max = s(0) Aver = s(0) Label1.Text = s(0) For i = 1 To

25、 9 s(i) = 30 + Int(Rnd() * 70) Label1.Text &= Space(4) & s(i) Aver += s(i) If s(i) Max Then Max = s(i) Next i Aver = Aver / 10 Label1.Text &= vbCrLf Label1.Text &= Min= & Min & Max= & Max & Average= & Aver & vbCrLfEnd Sub实验5-3Dim mark(19) As Integer Private Sub Button1_Click() Handles Button1.Click

26、产生 Dim i% For i = 0 To 19 mark(i) = Int(Rnd() * 100) Label1.Text &= mark(i) & Space(6 - Len(Str(mark(i) If (i+1) Mod 5 = 0 Then Label1.Text &= vbCrLf Next i End Sub Private Sub Button2_Click() Handles Button2.Click 统计 Dim s%(9), i%, k% For i = 0 To 19 k = mark(i) 10 Select Case k Case 0 To 5 不及格人数 s

27、(5) = s(5) + 1 Case 9 To 10 优秀人数 s(9) = s(9) + 1 Case 6 To 8 其他三个分数段的人数 s(k) = s(k) + 1 End Select Next i For i = 5 To 9 Label2.Text &= s( & i & )的人数有 & s(i) & 个 & vbCrLf NextEnd Sub实验5-4Dim a%(9), i%, j%, imax%, m Private Sub Button1_Click() Handles Button1.Click 产生 Randomize() For i = 0 To 9 a(i)

28、= Int(Rnd() * 90) + 10 Label1.Text &= & a(i) Next End Sub Private Sub Button2_Click() Handles Button2.Click 排序 For i = 0 To 8 imax = i For j = i + 1 To 9 If a(j) a(imax) Then imax = j End If Next m = a(i) a(i) = a(imax) a(imax) = m Next For i = 0 To 9 Label2.Text &= & a(i) Next End Sub实验5-6Dim n%, a

29、%(100, 100), i%, j% Private Sub TextBox1_KeyPress() Handles TextBox1.KeyPress If Asc(e.KeyChar) = 13 Then n = Val(TextBox1.Text) For i = 0 To n - 1 For j = 0 To i If i = 0 Or j=0 Or i=j Then a(i, j) = 1 Else a(i, j) = a(i - 1, j - 1) + a(i - 1, j) End If Label1.Text &= a(i, j) & Space(4 - Len(Trim(a

30、(i, j) Next Label1.Text &= vbCrLf Next End IfEnd Sub实验5-8Private Sub Form1_Load() Handles Me.Load ListBox1.Sorted = True ListBox2.Sorted = True ListBox1.Items.Clear() ListBox1.Items.Add(大学计算机基础) ListBox1.Items.Add(C/C+程序设计) ListBox1.Items.Add(VB程序设计) ListBox1.Items.Add(Web程序设计) ListBox1.Items.Add(多媒

31、体技术与应用) ListBox1.Items.Add(数据库技术与应用) ListBox1.Items.Add(网络技术与应用) ListBox1.Items.Add(硬件技术基础) ListBox1.Items.Add(软件技术技术基础) End Sub Private Sub ListBox1_Click() Handles ListBox1.Click If ListBox2.Items.Count = 5 Then MsgBox(超过门课程，不能再选) Exit Sub Else ListBox2.Items.Add(ListBox1.Text) ListBox1.Items.Remo

32、veAt(ListBox1.SelectedIndex) End IfEnd Sub实验5-9Private Sub ComboBox1_KeyPress() Handles ComboBox1.KeyPress Select Case Asc(e.KeyChar) Case 48 To 57, 13 If Asc(e.KeyChar) = 13 Then ComboBox1.Items.Add(ComboBox1.Text) ComboBox1.Text = End If Case Else e.Handled = True End Select End Sub Private Sub Bu

33、tton1_Click() Handles Button1.Click Dim min, imin, max, imax, t, i As Integer max = ComboBox1.Items(0) min = ComboBox1.Items(0) imin = 0 imax = 0 For i = 1 To ComboBox1.Items.Count - 1 If Val(ComboBox1.Items(i) max Then max = ComboBox1.Items(i) imax = i End If If Val(ComboBox1.Items(i) min Then min = ComboBox1.Items(i) imin = i End If Next t = ComboBox1.Items(ComboBox1.Items.Count - 1) Combo