苏州大学版 牛又奇 孙建国主编 Visual Basic 课后习题答案全

1、第一章1、 B2、 A3、 B4、 答：属性：红色、充满氢气；事件：松手、针刺；方法：飞走、爆破。5、 答：事件是指对象能够识别并作出反映的外部刺激。事件驱动又称消息驱动，事件驱动程序设计是指每个事件对应有相应的程序代码，仅在该事件发生时，该段代码才会被执行。事件发生的顺序决定了代码执行的顺序，因此每次执行应用程序时，程序代码并不是按照程序编写的顺序来执行的。6、 答：VB是一个包括界面设计、程序编码、调试、编译并创建可执行程序的集成开发环境。VB的集成开发环境的主界面中包含：标题栏、菜单栏、工具栏、控件箱、工程资源管理器、属性窗口、“窗体布局”窗口、窗体设计器、代码编辑器等元素组成。7、 答

2、： VB菜单条通常情况下有：文件、编辑、视图、工程、格式、调试、运行、查询、图表、工具、外接程序、窗口、帮助等13项菜单项组成。8、 答：工具栏可自行定义。标准工具栏中通常情况下有：添加标准exe工程、添加窗体、菜单编辑器、打开工程、保存工程、剪切、复制、粘贴、查找、撤消、重复、启动、中断、结束、工程资源管理器、属性窗口、窗体布局窗口、对象浏览器、工具箱、数据视图窗口、可视化元件管理器等按钮组成。9、 答：创建VB应用程序的一般步骤为：创建界面；设置窗体和控件属性；编写代码；保存工程；运行并调试程序；检查并排除错误；创建可执行文件。10、Private Sub Command1_Click()

3、 Label1.Caption = "I love vb,I hate vb"End Sub第二章1、开始temp=xx=y输入x、y结束输出新的x、yy=temp2、开始b>a?是否交换a、b否c>a?是交换a、cc>b?交换b、c是否结束输出a、b、c3、S1 输入待判断自然数： N（N>=2）；S2 i=2；S3 判断i是否小于N-1，若不是转S5S4 判断N除以i的余数是否为0,如果不是则i=i+1转S3；S5 判断i是否等于N，若是输出“是素数”，否则输出“不是素数”。4、S1 输入待判断自然数： N；S2 将N转换成字符S，计算S的长度K

4、；S3 i=1；S4 判断i是否小于K-1，若不是转S6；S5 判断S中的第i位和第K-i+1位是否相等,如果是则i=i+1转S4，如果不是则转S6；S6 判断i是否是中间位数，若是输出“是回文数”，否则输出“不是回文数”。5、S1 输入待判断自然数： a；S2 i=1；S3 判断i是否小于a-1，若不是转S5S4 判断a除以i的余数是否为0,如果是则保留因子i，否则i=i+1转S3；S5 输出所有因子。6、开始边长>0?是否能组成三角形计算输出出错信息结束是否是否第三章1、窗体的属性主要分为杂项、外观、行为、字体、位置等五类。Caption是窗体标题，出现在窗体标题栏的文本内容；而Na

5、me是窗体名称，在程序代码中被作为窗体的标识名。2、ABDE4、改变窗口的工作状态会引发Activate事件，改变窗口大小会引发resize事件。5、forecolor和backcolor属性首先选择系统中的选项，然后在调色板中设置相应的颜色；font属性设置好以后，在窗体上放置的任何控件都会继承窗体的font属性。6、C7、Label、optionbutton、checkbox、commandbutton有caption属性，没有text属性；text、combobox有text属性，没有caption属性8、对象的属性可以在设计界面时在属性窗口中和运行中在代码中设置；属性窗口中的属性列表并

6、没有包括对象的所有属性。9、picturebox、frame等10、optionbutton和checkbox。Optionbox的Value可以取true选中和false未选中，checkbox的Value可以取0未选中，1选中，2变灰，表示暂时不能访问。11、text、commandbutton可以获得焦点。在设计界面时第一个放在窗体上的文本框或命令按钮将得到焦点。12、C13、把Value的值设为2，表示暂时不能访问复选框，点击复选框后就可以访问了，而把enabled属性设为false则是复选框变灰，完全不能访问。若把一个控件的Visible属性设为false则在程序运行时看不到该控件。

7、14、用additem来添加列表项，用removeitem删除已有的列表项，用clear删除所有列表项。15、 16、Private Sub Check1_Click() If Check1.Value = 1 Then Label2.Font.Italic = True ElseIf Check1.Value = 0 Then Label2.Font.Italic = False End IfEnd SubPrivate Sub Check2_Click() If Check2.Value = 1 Then Label2.Font.Bold = True ElseIf Check2.Valu

8、e = 0 Then Label2.Font.Bold = False End IfEnd SubPrivate Sub Command1_Click() EndEnd SubPrivate Sub Option1_Click() If Option1.Value Then Label2.Font.Size = 12 Label2.RefreshEnd SubPrivate Sub Option2_Click() If Option2.Value Then Label2.Font.Size = 14 Label2.RefreshEnd SubPrivate Sub Option3_Click(

9、) If Option3.Value Then Label2.Font.Size = 16 Label2.RefreshEnd SubPrivate Sub Option4_Click() If Option4.Value Then Label2.Font.Name = "宋体" Label2.RefreshEnd SubPrivate Sub Option5_Click() If Option5.Value Then Label2.Font.Name = "隶书" Label2.RefreshEnd SubPrivate Sub Option6_Cli

10、ck() If Option6.Value Then Label2.Font.Name = "黑体" Label2.RefreshEnd Sub17、18、第四章1. B2. 见教材P40-413. 不对，通用过程也可以存在于窗体模块中4. 见教材P435. 字符串型常量的界定符是双引号"，日期型数据的界定符是磅号#。A、B是字符型，C、D是日期型，E、F不属于任何类型。6. 合法变量名有：A、C、D （VB中合法变量名只能由字母、数字和下划线构成，并且只能以字母开头）7. 见教材P468. (1) a/(b+c/d) (2) (sqr(x2+1)+x)(1/3)

11、 (3) (2*y)/(a*x+b*y)*(a*x-b*y)(4) 1+1/(1+1/m)(5) (d/3)(2*x)/2 (6) log(y+cos(x)2)(7) fabs(exp(x)+sin(x)3)/(x+y)(8)log(exp(x*y)+fabs(tan(z)-1+cos(x)3)/(x+y-z)9. (1)(2) (A+B)/(A-B)(3)(4) A*B*C/(D+1)*Y)(5)(6) (X*Y)510. A x+y<10 and x-y>0B x*y>0 and x=fix(x) and y=fix(y)C A=0 XOR B=0D C1+C2+C3&g

12、t;=255 and C1>90 and C2>90 and C3>8011. T F F F F12. BCDE （A会发生溢出的错误）13. (1) "3548" (2) 3548 (3) "3548" (4) 3548(5) "83" (6) 83 (7) "3548" (8) 354814. 以2为底的X的对数：log(x)/log(2)15. C16. z=Inputbox("输入一个数："，"程序示例"，1.5)17. Msgbox "

13、Z的值1.5大于0"，48，"程序示例"18. Option ExplicitConst PI As Single = 3.14159Private Sub Command1_Click() Dim a As Single, b As Single, c As Single, area As Single a = Val(Text1.Text) b = Val(Text2.Text) c = Val(Text3.Text) * PI / 180 '角度角转换为弧度角 area = a * b * Sin(c) / 2Text4 = CStr(Format(

14、area, "0.00") '使纯小数能出现整数位的0End Sub Private Sub Command2_Click() Text1.Text = "" Text2.Text = "" Text3.Text = ""End SubPrivate Sub Command3_Click() EndEnd Sub第五章1. Option ExplicitPrivate Sub Command1_Click() Dim a As Integer, b As Integer a = 1: b = 0 Do Wh

15、ile a <= 5 b = b + a * a a = a + 1 Loop Print a, bEnd SubPrivate Sub Command2_Click() Dim ch As String, i As Integer ch = "DEF" For i = 1 To Len(ch) '循环的上界不会变 ch = Mid(ch, 2 * i - 1, 1) & Left(ch, Len(ch) Print ch Next iEnd SubPrivate Sub Command3_Click() Dim p As Integer, i As

16、Integer p = 1 For i = 1 To 5 p = p + (2 * i - 1) / (2 * i + 1) If p >= 20 Then Exit For '跳出循环前执行不到这一句 Next i Print i, pEnd SubPrivate Sub Command4_Click() Dim p As Integer, i As Integer, n As Integer p = 2: n = 20 For i = 1 To n Step p '计数循环的初值、终值和步长都不会变 p = p + 2 n = n - 3 i = i + 1 If p

17、 >= 10 Then Exit For Next i Print i, p, nEnd Sub2.Option ExplicitDim n1 As Integer, n2 As Integer, n3 As IntegerPrivate Sub Command1_Click() Dim i As Integer, j As Integer, k As Integer For i = 1 To 10 For j = 1 To 10 k = Int(Rnd * 90 + 10) Print k; If k <= 40 Then n1 = n1 + 1 ElseIf k <= 7

18、0 Then n2 = n2 + 1 Else n3 = n3 + 1 End If Next j Print Next iEnd SubPrivate Sub Command2_Click() Print "小于等于40的数据个数为：" & n1 & "个" Print "大于40小于等于70的数据个数为：" & n2 & "个" Print "大于70的数据个数为：" & n3 & "个"End SubPrivate Sub

19、 Command3_Click() ClsEnd Sub3.Option ExplicitPrivate Sub Command1_Click() Dim x As Integer, y As Integer x = Text1.Text If x <= 0 Then y = 2 - x ElseIf x <= 2 Then y = x + 2 ElseIf x <= 5 Then y = x 2 Else y = 25 - x End If Text2.Text = y End SubPrivate Sub Command2_Click() Text1.Text = &qu

20、ot;" Text2 = ""End Sub4.Option ExplicitPrivate Sub Command1_Click() Dim i As Integer, j As Integer, k As Integer For i = 1 To 2 For j = 1 To 10 k = Int(Rnd * 900 + 100) Picture1.Print k; If k Mod 2 <> 0 Then List1.AddItem k Else List2.AddItem k End If Next j Picture1.Print Next

21、iEnd Sub5. Option ExplicitPrivate Sub Command1_Click() Dim m As Integer, n As Integer, r As Integer m = Val(Text1.Text) n = Val(Text2.Text) Do r = m Mod n If r <> 0 Then m = n n = r Else Exit Do End If Loop Text3.Text = Val(Text1.Text) * Val(Text2.Text) / nEnd Sub6.Option ExplicitDim r1 As Int

22、eger, r2 As Single 'r2可能是个很大的数，最好定义成单精度型Private Sub Command1_Click() Dim i As Integer, k As Integer r1 = 0: r2 = 1 'r2一定要初始化为1，否则积为0 For i = 1 To 10 k = InputBox("请输入第" & i & "个数") Picture1.Print k; r1 = r1 + k r2 = r2 * k Next iEnd SubPrivate Sub Command2_Click()

23、 Text1 = r1End SubPrivate Sub Command3_Click() Text2 = r2End Sub7.Option ExplicitPrivate Sub Command1_Click() Dim s As String, s1 As String, s2 As String, i As Integer s1 = Text1.Text For i = 1 To Len(s1) s = Mid(s1, i, 1) If s >= "0" And s <= "9" Then s2 = s2 & s End I

24、f Next i Text2.Text = s2End Sub8.Option ExplicitPrivate Sub Command1_Click() Text1 = "" Text2 = ""End SubPrivate Sub Command2_Click() Dim n As Integer, r As String, s As String n = Val(Text1.Text) Do r = n Mod 2 s = r & s n = n 2 Loop Until n = 0 '当商为0时则跳出循环 Text2.Text =

25、sEnd Sub9.Option ExplicitPrivate Sub Command1_Click() Dim a As Long, b As Long, c As Long For a = 1 To 100 For b = 1 To 100 For c = 1 To 100 If a * a + b * b = c * c Then List1.AddItem a & "," & b & "," & c End If Next c Next b Next aEnd Sub10.Option ExplicitPriva

26、te Sub Command1_Click() Dim i As Integer, r1 As Integer, r2 As Integer, r3 As Integer For i = 100 To 999 r1 = i 100 r2 = (i 10) Mod 10 '或者r2 = (i mod 100)10 r3 = (i Mod 100) Mod 10 If r1 < r2 And r2 < r3 Then List1.AddItem i End If Next iEnd Sub11.Option ExplicitPrivate Sub Command1_Click(

27、) Dim a As Single, b As Single, c As Single a = 0: b = 1 c = (a + b) / 2 Do If f(a) * f(c) > 0 Then a = c Else b = c End If c = (a + b) / 2 Loop Until Abs(b - c) <= 0.00001 Text1.Text = Format(c, "0.#")End SubPrivate Function f(x As Single) As Single f = x 3 - x 4 + 4 * x 2 - 1End Fu

28、nction第六章 6-1 请同学上机运行代码。6-2Option ExplicitOption Base 1Private Sub Command1_Click() Dim i As Integer, t As Integer Dim a(15) As Integer Randomize For i = 1 To 15 a(i) = Int(100 * Rnd) Text1 = Text1 & Str(a(i) Next i For i = 1 To 7 t = a(i) a(i) = a(16 - i) a(16 - i) = t Next i For i = 1 To 15 Te

29、xt2 = Text2 & Str(a(i) Next iEnd SubPrivate Sub Command2_Click() Text1 = "" Text2 = ""End SubPrivate Sub Command3_Click() EndEnd Sub6-3Option ExplicitDim a(20) As IntegerPrivate Sub Command1_Click() Dim i As Integer Randomize For i = 1 To 20 a(i) = Int(90 * Rnd) + 10 Text1 =

30、Text1 & Str(a(i) Next iEnd SubPrivate Sub Command2_Click() Dim i As Integer, j As Integer, f As Boolean Dim n As Integer For i = 1 To 20 f = True For j = i + 1 To 20 If a(i) = a(j) Then f = False Next j If f = True Then n = n + 1 Next i Text2 = nEnd SubPrivate Sub Command3_Click() Text1 = "

31、"End SubPrivate Sub Command4_Click() EndEnd Sub6-4Option ExplicitDim a(20) As IntegerPrivate Sub Command1_Click() Dim i As Integer Randomize For i = 1 To 20 a(i) = Int(90 * Rnd) + 10 Text1 = Text1 & Str(a(i) Next iEnd SubPrivate Sub Command2_Click() Dim i As Integer, j As Integer, max As In

32、teger Dim n As Integer, w As Integer, p As Integer For i = 1 To 20 n = 0: p = i For j = 1 To 4 If i > 20 Then p = p - 20 n = n + a(p) Next j If n > max Then max = n w = i End If Next i Text2 = max Picture1.Print w & "-" & w + 4End SubPrivate Sub Command3_Click() Text1 = "

33、;"End SubPrivate Sub Command4_Click() EndEnd Sub6-5Dim a(5, 5) As IntegerPrivate Sub Command1_Click() For i = 1 To 4 For j = 1 To 5 a(i, j) = Int(9 * Rnd) + 1 Picture1.Print a(i, j); Next j Picture1.Print Next iEnd SubPrivate Sub Command2_Click() For j = 1 To 5 s = 0 For i = 1 To 4 s = s + a(i,

34、 j) Next i Text1 = Text1 & Str(s) Next jEnd SubPrivate Sub Command3_Click() For i = 1 To 4 s = 0 For j = 1 To 5 s = s + a(i, j) Next j Text2 = Text2 & Str(s) & Chr(13) & Chr(10) Next iEnd SubPrivate Sub Command4_Click() Text1 = "" Text2 = "" Picture1.ClsEnd SubPri

35、vate Sub Command5_Click() EndEnd Sub6-6Option ExplicitPrivate Sub Command1_Click() Dim a(5, 5), i As Integer, j As Integer Dim n As Integer, m As Integer, t As Integer Randomize For i = 1 To 5 For j = 1 To 5 - 1 a(i, j) = Int(40 * Rnd) * 2 + 10 Next j Next i For i = 1 To 5 For j = 5 To 6 - i Step -1

36、 a(i, j) = Int(40 * Rnd) * 2 + 11 Next j Next i For i = 1 To 5 For j = 1 To 5 Text1 = Text1 & Str(a(i, j) Next j Text1 = Text1 & vbCrLf Next iEnd Sub6-7 同6-46-8Dim a(5, 5) As IntegerPrivate Sub Command1_Click() Randomize For i = 1 To 5 For j = 1 To 5 a(i, j) = Int(100 * Rnd) + 1 Picture1.Pri

37、nt Right(" " & a(i, j), 4); Next j Picture1.Print Next iEnd SubPrivate Sub Command2_Click() For i = 1 To 5 For j = 1 To 5 s = s + a(i, j) Next j Next i Text1 = Str(s)End SubPrivate Sub Command3_Click() For i = 1 To 5 For j = 1 To 5 If i = 1 Or j = 1 Or i = 5 Or j = 5 Then s = s + a(i,

38、j) End If Next j Next i Text2 = Str(s)End SubPrivate Sub Command4_Click() For i = 1 To 5 For j = 1 To 5 If i = j Or j = 6 - i Then s = s + a(i, j) End If Next j Next i Text3 = Str(s)End Sub6-9Option ExplicitPrivate Sub Command1_Click() Dim a() As Integer, i As Integer, j As Integer Dim max As Intege

39、r, k As Integer, f As Boolean Dim n As Integer, m As Integer, t As Integer n = InputBox("输入矩阵的行数：") m = InputBox("输入矩阵的列数：") ReDim a(n, m) Randomize For i = 1 To n For j = 1 To m a(i, j) = Int(90 * Rnd) + 10 Text1 = Text1 & Str(a(i, j) Next j Text1 = Text1 & vbCrLf Next i

40、 For i = 1 To n max = 0 For j = 1 To m If a(i, j) > max Then max = a(i, j) t = j End If Next j For k = 1 To n If a(k, t) < max Then Exit For Next k If k > n Then Picture1.Print "鞍点：" a(i, t); "第" i; "行" t; "列" f = True End If Next i If f = False Then

41、Picture1.Print "没有鞍点"End SubPrivate Sub Command2_Click() Text1 = "" Picture1.ClsEnd SubPrivate Sub Command3_Click() EndEnd Sub6-10Option ExplicitPrivate Sub Form_Click() Dim a() As Integer, n As Integer Dim i As Integer, j As Integer n = InputBox("层数") ReDim a(n, n) For

42、 i = 1 To n Print Tab(20 - 2 * i); For j = 1 To i If i = 1 Or i = j Then a(i, j) = 1 Else a(i, j) = a(i - 1, j - 1) + a(i - 1, j) End If Print Left(a(i, j) & " ", 4); Next j Print Next i End Sub6-11Option ExplicitPrivate Sub Command1_Click() Dim a(4, 5), i As Integer, j As Integer Dim

43、b(4) As Integer, max As Integer, min As Integer Dim n As Integer, m As Integer, t As Integer Randomize max = 0: min = 32767 For i = 1 To 4 For j = 1 To 5 a(i, j) = Int(90 * Rnd) + 10 Text1 = Text1 & Str(a(i, j) b(i) = b(i) + a(i, j) Next j Text1 = Text1 & vbCrLf If max < b(i) Then max = b

44、(i): m = i ElseIf min > b(i) Then min = b(i): n = i End If Next i Label1.Caption = "max行和： " & max & " min行和 ：" & min & vbCrLf & "max行： " & m & " min行： " & n & " 交换这两行" For j = 1 To 5 t = a(m, j) a(m, j) = a(n,

45、j) a(n, j) = t Next j For i = 1 To 4 For j = 1 To 5 Text2 = Text2 & Str(a(i, j) Next j Text2 = Text2 & vbCrLf Next iEnd Sub6-12Option ExplicitPrivate Sub Command1_Click() Dim a(), i As Integer, j As Integer Dim b(4) As Integer, max As Integer, min As Integer Dim n As Integer, m As Integer, t

46、 As Integer Randomize n = InputBox("矩阵阶数n:") ReDim a(n, n) For i = 1 To n For j = 1 To n a(i, j) = Int(90 * Rnd) + 10 Text1 = Text1 & Str(a(i, j) Next j Text1 = Text1 & vbCrLf Next i For i = 1 To n For j = 1 To n Text2 = Text2 & Str(a(j, i) Next j Text2 = Text2 & vbCrLf Nex

47、t iEnd SubPrivate Sub Command2_Click() Text1 = "" Text2 = ""End SubPrivate Sub Command3_Click() EndEnd Sub6-13Option ExplicitOption Base 1Private Sub Command1_Click() Dim a(3, 3) As Integer, i As Integer, j As Integer Dim max As Long, k As Long, f As Integer Dim n As Integer, m A

48、s Integer Randomize For i = 1 To 3 For j = 1 To 3 a(i, j) = Int(90 * Rnd) + 10 Text1 = Text1 & Str(a(i, j) Next j Text1 = Text1 & vbCrLf Next i For i = 1 To 3 '主对角线方向 m = i k = 1 For j = 1 To 3 k = k * a(m, j) m = m + 1 If m > 3 Then m = 1 Next j If k > max Then max = k n = i f = 1 End If Next i For i = 1 To 3 '辅对角线方向 m = i k = 1 For j = 1 To 3 k = k * a(j, m) m = m - 1 If m < 1 Then m = 3 Next j If k > max Then max = k n = i f = 2 End If Next