vb程序设计题

1、五、设计题 (请按照题目要求进行答题 )1：编程，输入 x，求下列分段函数的值，计算结果输出到 Text 控件中。Private Sub Command1_Click()Dim x As Singlex = InputBox(输入 x, 计算分段函数)If x Then List1.AddItem Text1.TextText1.Text = End SubPrivate Sub Command2_Click() List1.RemoveItem List1.ListIndexEnd SubPrivate Sub Command3_Click() Dim I As IntegerOpen d:student.dat For Output As #1For I = 0 To List1.ListCount - 1: Print #1, List1.List(I): Next IClose #1End SubPrivate Sub Command4_Click() EndEnd Sub4：设计一个简单的画板程序，可以根据选择的颜色，用鼠标的左键模拟画笔，在绘图区画线或画矩形；单击“清除”按

2、钮后清除图片框的内容。 （提示：每次画矩形时可先清除其它图案）参考答案：Dim x1 As Single, y1 As SinglePrivate Sub Command1_Click()CommonDialog1.ShowColorPicture1.ForeColor = CommonDialog1.ColorEnd SubPrivate Sub Command2_Click()Picture1.ClsEnd SubPrivate Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)Picture1.CurrentX = XPicture1.CurrentY = Yx1 = Xy1 = YEnd SubPrivate Sub Picture1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)If Button = 1 ThenIf Option1.Value ThenPic

3、ture1.Line -(X, Y)ElsePicture1.ClsPicture1.Line (x1, y1)-(X, Y), , BEnd IfEnd IfEnd Sub五、设计题 (请按照题目要求进行答题 )第 1 题：编程，用随机函数产生 2 个 10100 的整数，输出最大值。参考答案：Private Sub Command1_Click()Dim x as integer,y as integer,max as integerRandomizex = Int(Rnd * 91 + 10)y = Int(Rnd * 91 + 10)Max = xIf y Max Then y = MaxPrint MaxEnd Sub第 2 题：如下图，编写事件过程 Command1_Click 和 Text3_Keypress(Keyascii As Integer)事件，运行时单击“出题”按钮，自动在 Text1 和 Text2 中显示两个 2 位随机正整数；用户在 Text3 中输入运算结果，按回车后计算机对运算结果进行评判，并将评判结果在 Label2中显示（对了或错了） 。要求文本

4、框 Text3 只接受数字和回车键。(回车键的 Ascii 码为 13，数字键的 Ascii 码为 48 到 57) 参考答案：Dim x As Integer, y As IntegerPrivate Sub Command1_Click()x = Int(Rnd * 90) + 10: y = Int(Rnd * 90) + 10Text1.Text = CStr(x): Text2.Text = CStr(y)Text3.Text = Text3.SetFocusLabel2.Visible = False: Command1.Enabled = FalseEnd SubPrivate Sub Form_Load()Text1.Text = : Text2.Text = : Text3.Text = Label2.Visible = FalseRandomizeEnd SubPrivate Sub Text3_KeyPress(KeyAscii As Integer)If (KeyAscii 57) And KeyAscii = y Then r = x Else r = yPi

5、cture1.Circle (x, y), r, , , , y / xEnd Sub五、设计题 1：编程，求算式 1+1/2！ +1/3！+1/4！+前 10 项的和。 Private Sub Command1_Click()Dim I as integer, s as single，a as singlea = 1: s = 0For i = 1 To 10a = a / is = s + aNext iPrint 1+1/2!+1/3!+=; sEnd Sub2：设计一个用于输入学生信息的应用程序。界面如图所示（民族有汉族、苗族、壮族等；政治面貌有：群众、团员、党员） 。要求：（1）输入完毕后单击确定按钮，能在另一窗口显示输入的信息（2）单击取消按钮，将取消所输入的信息。Public info As StringDim s As StringPrivate Sub Command1_Click()info = 学号为 + Text1.Text + ,姓名为 + Text2.Text + , 性别为 + s + ，民族为 + Combo1.Text + ， 政治面貌为 + Comb

6、o2.Text+”.”Form2.ShowEnd SubPrivate Sub Command2_Click() Call Form_LoadEnd SubPrivate Sub Form_Load()Text1.Text = :Text2.Text = Option1.Value = True :Option2.Value = FalseCombo1.Text = 汉族 :Combo2.Text = 群众End SubPrivate Sub Option1_Click()s = 男End SubPrivate Sub Option2_Click()s = 女End Sub3：编程实现两个文本文件的合并，要求用驱动器、目录、文件列表框选择文件 1，单击按钮 1 后，调用通用对话框选择文件 2；单击按钮 2 后，将文件 2 的内容添加到文件 1原来内容之后，然后删除文件 2。Dim fn As String Private Sub Command1_Click()CommonDialog1.Filter = (*.txt)|*.txtCommonDialog1.ShowOpen End

7、SubPrivate Sub Command2_Click()Dim s As StringOpen fn For Append As #1 Open CommonDialog1.FileName For Input As #2Do While Not EOF(2) Line Input #2, sPrint #1, sLoopCloseKill CommonDialog1.FileName End SubPrivate Sub Dir1_Change()File1.Path = Dir1.Path End SubPrivate Sub Drive1_Change()Dir1.Path = Drive1.Drive End SubPrivate Sub File1_Click()If Right(File1.Path, 1) = Then fn = File1.Path + File1.FileNameElsefn = File1.Path + + File1.FileNameEnd IfEnd SubPrivate Sub Form_Load()File1.Pattern = *.t

8、xtEnd Sub第 4 题：设计一程序，界面如图所示。程序运行后，单击“计时开始”命令按钮，开始计时，并在文本框 1 中以如图所示格式显示计时时间，单击“计时结束”命令按钮后，停止计时，并根据时间计算上网费用，计算的方法如下（不足 15 分钟忽略不计，超过 15 分钟则按 1 小时计算） 。参考答案：Dim n As Integer, h As Integer, m As IntegerPrivate Sub Command1_Click()Timer1.Enabled = TrueEnd SubPrivate Sub Command2_Click()Timer1.Enabled = FalseIf m = 15 Then h = h + 1If h -1 Then List1.RemoveItem List1.ListIndexEnd Sub第 3 题：设计一个图片欣赏程序（界面如图所示） ，要求程序启动后可以通过选择驱动器、文件夹，最后单击文件列表框中的图片文件时，图片载入 Picture2 中。如果图片大小超过容器 Picture1 的大小，则使用水平或垂直滚动条移动 Pict

9、ure2 在 Picture1 中的位置进行浏览。Private Sub Dir1_Change() File1.Path = Dir1.Path End SubPrivate Sub Drive1_Change() Dir1.Path = Drive1.Drive End SubPrivate Sub File1_Click()If Right(File1.Path, 1) = Thenf$ = Form1.File1.Path + Form1.File1.FileName Elsef$ = Form1.File1.Path + + Form1.File1.FileNameEnd If Picture2.Picture = LoadPicture(f$) If Picture2.Height Picture1.Height Then VScroll1.Visible = True If Picture2.Width Picture1.Width Then HScroll1.Visible = TrueHScroll1.Max = Picture2.Width - Picture1.Width VScroll1.Max = Picture2.Height - Picture1.HeightEnd SubPrivate Sub Form_Load()File1.Pattern = *.bmp;*.jpg;*.gif VScroll1.Visible = FalseHScroll1.Visible = FalseEnd SubPrivate Sub HScroll1_Change() Picture2.Left = -HScroll1.Value End SubPrivate Sub HScroll1_Scroll()Picture2.Left = -HScroll1.ValueEnd SubPriva

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