第4章習(xí)題

一、單選題

1．C     2．A     3．C               

4．C     5. B     6. A

7．D     8．B     9．B               

10．(1)D (2)A (3)B

二、多選題

1．ABCFGHJ             

2．BE            

3．CD       

4. CDE         

5. AE

三、填空題

1．(S And (A>=18 And A <=20) And H>=1.65) Or (Not S And (A>=16 And Age<=18) And H>=1.60)

2. 60000              

3. (1) "0" To "9"    (2) "a" To "z","A" To "Z"    (3) Else

4．(1)6  (2)-2  (3)2

5． Select Case x                            Case Is < 20           

    Case Is <= 0                              y = 2                 

           y = 4                           Case Is <= 30 

      Case Is < 10                              y = 3          

           y = 0                           Case Else  

      Case Is < 15                              y = 4     

           y = 1                       End Select           

6．(1) (x>100) And (x Mod 5=0)             (2) 0

      (3) Len(Text1.Text)                     (4) Text1.SelText

編程及上機(jī)調(diào)試

1. 在窗體上建立兩個文本框Text1(輸入數(shù))及Text2(顯示結(jié)果)，一個命令按鈕Command1(“判斷”)。

Private Sub Command1_Click()            '“判斷”

        x = Val(Text1.Text)

        If x Mod 2 = 0 Then

             Text2.Text = "偶數(shù)"

        Else消息

             Text2.Text = "奇數(shù)"

        End If

End Sub

2．窗體上建立了一個文本框Text1，用于顯示結(jié)果。

Private Sub Form_Load()

        x = Val(InputBox("請輸入星期幾(0～6)"))

        Select Case x

            Case Is = 0

               Text1.Text = "星期日(Sunday)"

            Case Is = 1

               Text1.Text = "星期一(Monday)"

            Case Is = 2

               Text1.Text = "星期二(Tuesday)"

            Case Is = 3

               Text1.Text = "星期三(Wednesday)"

            Case Is = 4

               Text1.Text = "星期四(Thursday)"

            Case Is = 5

               Text1.Text = "星期五(Friday)"

            Case Is = 6

               Text1.Text = "星期六(Saturday)"

            Case Else

               Text1.Text = "輸入錯誤"

       End Select

End Sub

3．窗體上建立了一個文本框Text1(“輸入口令”)和一個命令按鈕Command1(“檢查”)。

Private Sub Command1_Click()            '“檢查”

       x = Text1.Text

       If x = "12345678" Then

           MsgBox ("歡迎你用機(jī)!")

       Else

           MsgBox ("對不起，口令錯")

       End If

       Text1.Text = ""

       Text1.SetFocus

End Sub

Private Sub Form_Load()

       Text1.Text = ""

       Text1.MaxLength = 8

       Text1.PasswordChar = "*"

End Sub

4．窗體上建立了兩個文本框Text1(輸入字符串)及Text2(轉(zhuǎn)換結(jié)果)，一個命令按鈕Command1(“清除”)。

Private Sub Command1_Click()               '“清除”

       Text1.Text = ""

       Text2.Text = ""

       Text1.SetFocus

End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)

       Dim s As String * 1

       s = Chr(KeyAscii)

      Select Case s

          Case "A" To "Z"

              s = LCase(s)

          Case "a" To "z"

              s = UCase(s)

          Case Else

              s = "*"

      End Select

      Text2.Text = Text2.Text + s

End Sub

5． 分別選擇”紅”、 ”綠”、 ”藍(lán)”復(fù)選框后，單擊命令按鈕Command1時，通過RGB函數(shù)調(diào)配的顏色作為一個標(biāo)簽的背景色（BackColor）。

Private Sub Command1_Click()

      r = 0: g = 0: b = 0

      If Check1.Value = 1 Then      '”紅”復(fù)選框

          r = 255

      End If

      If Check2.Value = 1 Then      '”綠”復(fù)選框   

          g = 255

      End If

      If Check3.Value = 1 Then      '”藍(lán)”復(fù)選框

          b = 255

      End If

      Label1.BackColor = RGB(r, g, b)

End Sub

6．程序代碼如下：

Private Sub Form_Load()

    LabClk.Caption = "0"

    LabClk.Alignment = 1

    LabClk.BorderStyle = 1

    LabClk.FontSize = 22

    LabClk.FontName = "黑體"

    TimClk.Interval = 1000

End Sub

 Private Sub TimClk_Timer()

       LabClk.Caption = Val(LabClk.Caption) + 1

End Sub

7． (1) Chr(KeyAscii)              (2) ElseIf Chr(KeyAscii)      

    (3) CheC = CheC - 1            (4) CheC               (5) Is > 0 或 Else