实验A VB环境和可视化编程基础
1．
（1）运行界面
（2）参考代码：
Private Sub Command1_Click()
label3.Caption = text1.Text
End Sub
2．模仿教材例1.1，将事件过程中自上而下移动改为自右向左移动，也要考虑文字出窗体边界的情况。
（1）运行界面
（2）参考代码：
Private Sub Command1_Click()
Timer1.Interval = 0
Call mymove
End Sub
Sub mymove()
Label1.Move Label1.Left - 20
If Label1.Left = 0 Then Label1.Left = Form1.Width
End Sub
Private Sub Command2_Click()
Timer1.Interval = 200
End Sub
Private Sub Timer1_Timer()
Call mymove
End Sub
3．编写一程序，在文本框中统计在该窗口上鼠标单击的次数。（1）运行界面：
（2）编写代码：
Private Sub Form_Click()
Text1 = Val(Text1) + 1
End Sub
Private Sub Form_Load()
Text1.Text = ""
End Sub
4．代码：
Private Sub Form_Click()
Form1.Caption = "鼠标单击"
Form1.Picture = LoadPicture("d:\1.jpg")
End Sub
Private Sub Form_DblClick()
Form1.Caption = "鼠标双击"
Form1.Picture = LoadPicture("d:\2.jpg")
End Sub
Private Sub Form_Load()
Form1.Picture = LoadPicture("d:\3.jpg")
End Sub
5．命令按钮、字号、内容和格式的复制练习（1）运行界面
（2）参考代码：
Private Sub Command1_Click()
Text1.FontName = "黑体"
Text1.FontSize = 25
End Sub
Private Sub Command2_Click()
Text2.Text = Text1.SelText
Text2.FontName = Text1.FontName
Text2.FontSize = Text1.FontSize
Text1.SetFocus
End Sub
实验B 顺序结构
1．编一个华氏温度与摄氏温度之间转换的程序，要求用按钮实现转换。既单击“华氏转摄氏”按钮，则将华氏温度转换为摄氏温度；同样，单击“摄氏转华氏”按钮，则将摄氏温度转换为华氏温度。
代码：
Private Sub Command1_Click()
Dim f!, c!
f = Val(Text1.Text)
c = 5 / 9 * (f - 32)
Text2.Text = Format(c, "0.00")
End Sub
Private Sub Command2_Click()
Dim f!, c!
c = Val(Text2.Text)
f = 9 / 5 * c + 32
Text1.Text = Format(f, "0.00")
End Sub
2．（1）运行界面
（2）参考代码
Private Sub Command1_Click()
r = Text1.Text
Label1.Caption = Format(3.14 * r * r, ".00")
Text1.SetFocus
End Sub
Private Sub Command2_Click()
r = Val(Text1.Text)
Label2.Caption = Format(3.14 * 2 * r, ".00")
Text1.SetFocus
End Sub
Private Sub Text1_KeyPress(KeyAscii As Integer) If KeyAscii = 13 Then
If Not IsNumeric(Text1) Then
MsgBox "输入有误,请重输入"
Text1.SetFocus
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
End If
End If
End Sub
Private Sub Text1_LostFocus()
If Not IsNumeric(Text1) Then
MsgBox "输入有非数字字符,请重新输入", , "2-2" Text1.SetFocus
Text1.SelStart = 0
