Windows程序设计（VB.NET）》在线作业二
1.C
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2.A
3.A
4.A
5.A
6.C
7.D
8.A
9.A
10.D
11.D
12.D
13.B
14.D
15.A
16.B
17.C
18.A
1.A
2.B
VB点虐
作业，用VB做一个简单的计算器.
我用VB做的你看能不能用
Public b
Public c
Public d
Public e
Public f
Private Sub Command14_Click()
d = ""
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Exit Sub
'c = Text1.Text
If b = "" Then Exit Sub
If e = "+" Then
d = f + b
Else
If e = "-" Then
d = f - b
Else
If e = "*" Then
d = f * b
Else
If e = "/" Then
If b = 0 Then
MsgBox "被除数不能为零！"
Exit Sub
End If
d = f / b
Else
MsgBox "错误操作！"
End If
End If
End If
End If
Text1.Text = d
b = ""
c = ""
e = ""
End Sub
Private Sub Command15_Click()
Text1.Text = ""
b = ""
c = ""
d = ""
e = ""
f = ""
End Sub
Private Sub Form_Load()
Text1.Text = ""
End Sub
Private Sub Command1_Click()
'判断开头有运算符就清零
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
'判断开头有0就禁止输入数字
If Text1.Text = "0" Then
Else
a = 1
'发现运算结果就清零
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text '得到当前操作数
End Sub
Private Sub Command2_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 2
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command3_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 3
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command4_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 4
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command5_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 5
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command6_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 6
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command7_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 7
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command8_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 8
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command9_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 9
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command10_Click()
If b = "" Then Exit Sub
a = "+"
e = "+"
f = b
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command11_Click()
If b = "" Then Exit Sub
f = b
a = "-"
e = "-"
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command12_Click()
If b = "" Then Exit Sub
a = "*"
e = "*"
f = b
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command13_Click()
If b = "" Then Exit Sub
a = "/"
e = "/"
f = b '把操作数1提取出来
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command16_Click()
'判断有运算符就清零
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
'判断有零和空值就禁止输入0
'发现运算结果就清零
If d "" Then Text1.Text = "": d = ""
If Text1.Text = "0" Then
Else
a = 0
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
b = Text1.Text
End If
End Sub
vb点虐
作业，打开某一文件夹，将内容倒排，保存到另一文件夹怎么做
'这是VB的要先引用Microsoft Scripting RunTime，下面的例子是找叫cmd.xxx的文件的
Private Sub Command1_Click()
Dim m_objFSO As New FileSystemObject
Dim objFolder As Scripting.Folder '文件夹对象
Dim objFile As Scripting.File '文件对象
Set objFolder = m_objFSO.GetFolder("c:/test")
For Each objFile In objFolder.Files
Dim filenames() As String
filenames = Split(objFile.Name, ".")
If filenames(0) = "cmd" Then
FileCopy objFile.Path, "c:/TestCMD/" "newName." filenames(1)
End If
Next objFile
End Sub
-----------------------------------这是VB点虐
的--------------------------
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer
Dim files() As String
files = System.IO.Directory.GetFiles("C:/test")
For i = 0 To files.Length - 1
Dim filenames() As String
filenames = files(i).Substring(files(i).LastIndexOf("\") + 1).Split(".")
If filenames(0) = "cmd" Then
FileCopy(files(i), "c:/TestCMD/" "newName." filenames(1))
End If
Next
End Sub
vb点虐
作业，画坐标轴及标尺，画y=sin（x）曲线
Private Sub mainfrm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim pt(200) As PointF
Dim a As Integer
For a = 0 To 200
pt(a).X = 50 * a
pt(a).Y = 200 - 50 * Math.Sin(a - 1)
Next
Me.CreateGraphics.DrawLine(Pens.Blue, 0, 200, 800, 200)
Me.CreateGraphics.DrawLine(Pens.Blue, 50, 0, 50, 600)
Me.CreateGraphics.DrawCurve(Pens.Blue, pt)
End Sub
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