大学计算机VB程序设计考试题目.docx

1、大学计算机VB程序设计考试题目实验三第1题 四则运算题设计如下窗体，为五个命令按钮编写5段代码完成四则运算及退出程序，其中在计算除法时，如果第二个数是零，在消息框中显示信息“除数为零”。Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a, b As Single a = TextBox1.Text b = TextBox2.Text TextBox3.Text = a + b End

2、 Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim a, b As Single a = TextBox1.Text b = TextBox2.Text TextBox3.Text = a - b End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.

3、Click Dim a, b As Single a = TextBox1.Text b = TextBox2.Text TextBox3.Text = a * b End Sub Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click Dim a, b As Single a = TextBox1.Text b = TextBox2.Text If b = 0 Then MessageBox.Show(除数为零) Else TextB

4、ox3.Text = a / b End If End Sub Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click End End SubEnd Class第2题 一元二次方程求解输入系数后，单击“求解”按钮后，根据判别式的3种不同情况，分别显示如下的不同结果。 Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As

5、 System.EventArgs) Handles Button1.Click Dim a, b, c, delta As Double a = TextBox1.Text b = TextBox2.Text c = TextBox3.Text delta = b * b - 4 * a * c If delta 0 Then Label5.Visible = True Label6.Visible = True Label4.Text = 方程有两个不相等实根 Label5.Text = X1= & (-b + Math.Sqrt(delta) / 2 / a) Label6.Text =

6、 X2= & (-b - Math.Sqrt(delta) / 2 / a) ElseIf delta = 0 Then Label4.Text = 方程有两个相等实根 Label5.Visible = True Label5.Text = X1=X2= & (-b / 2 / a) Label6.Visible = False Else Label4.Text = 方程没有实根 Label5.Visible = False Label6.Visible = False End If End Sub Private Sub Button2_Click(ByVal sender As Syste

7、m.Object, ByVal e As System.EventArgs) Handles Button2.Click End End SubEnd Class第3题 文本框中前景色和背景色的不同组合目的：单选按钮的使用（1）设计窗体如下所示窗体中包含两组单选按钮、两个框架和一个命令按钮。（2）程序功能：分别单击不同的前景色和背景色按钮，在文本框中显示颜色的改变。（3）设置控件的主要属性1）窗体的文本属性为“不同前景色背景色的组合”2）初始前景色为红色、背景色为黄色3）其它属性根据图中显示来设置（4）事件代码Public Class Form1 Private Sub RadioButton

8、1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged TextBox1.ForeColor = Color.Red End Sub Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged TextBox1.For

9、eColor = Color.Green End Sub Private Sub RadioButton3_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton3.CheckedChanged TextBox1.ForeColor = Color.Black End Sub Private Sub RadioButton4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.Event

10、Args) Handles RadioButton4.CheckedChanged TextBox1.BackColor = Color.White End Sub Private Sub RadioButton5_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton5.CheckedChanged TextBox1.BackColor = Color.Yellow End Sub Private Sub Form1_Load(ByVal sender As

11、System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End SubEnd Class第4题 三位整数的反序显示在窗体中添加二个文本框、二个标签和一个命令按钮，在一个文本框中输入一个三位的整数，单击命令按钮后，在另一个框中按相反顺序显示该数，例如，输入123，则在另一个文本框中显示321。 提示：本题先将每位上的数字分解出来，这要用到整除和计算余数的运算符，例如123整除100后的结果1就是百位，而123除以10的余数就是个位，至于十位，大家可以自己确定。分解后的三位数再倒序组合成新的三位整数。Public Class

12、Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a, b, c, d, y As Single a = TextBox1.Text b = a 100 c = (a - 100 * b) 10 d = a - 100 * b - 10 * c TextBox2.Text = d & c & b End SubEnd Class试验五第1题 累加编写程序，计算1100之间的所有偶数之和，程序窗口界面及控件自行设

13、计。Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim i, sum As Long For i = 2 To 100 Step 2 sum += i Next TextBox1.Text = sum End SubEnd Class第2题 使用循环求解水仙花数的问题要求：（1）参考教材上例4-3关于水仙花数的定义。（2）程序窗口界面及控件与例4-3的结果即图4-3一样。 （3）单击“开

14、始”按钮后，在文本框中显示求出的结果。Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim M, k1, k2, k3 As Integer TextBox1.Clear() For M = 100 To 999 k1 = M 100 k2 = (M 10) Mod 10 k3 = M Mod 10 If M = k1 3 + k2 3 + k3 3 Then TextBox1.Text

15、+= M.ToString() + = + k1.ToString() + 3+ + k2.ToString() + 3+ + k3.ToString() + 3 + vbCrLf End If Next End SubEnd Class第3题 统计整数的因子编写程序，向一个文本框输入一个整数，单击“开始”按钮后，找出该数的所有因子，并统计因子的个数和总和，结果在另一个文本框中显示，共有三行，其中第一行该数的所有因子，第二行显示该数的因子个数，最后一行显示该数所有因子之和，窗体界面如下：Public Class Form1 Private Sub Button1_Click(ByVal sen

16、der As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a, b, c, d As Long c = 0 a = TextBox1.Text b = 1 While b = a If a Mod b = 0 Then c += 1 d += b TextBox2.Text = 该整数的因子是： & +=CStr(b) + , + vbCrLf + 因子个数为： + c.ToString() + vbCrLf + 因子之和为： + d.ToString() End If b = b + 1 End

17、While End SubEnd Class第4题 判断素数编写程序，判断某个整数是否是素数，在一个文本框中输入一个整数，单击命令按钮后，在另一个文本框中显示该数是否是素数，程序代码可以参考例4-10的代码，在此基础上改写。以下是输入不同整数后的两种不同的结果，窗体结构也参照下图。 Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim i, j As Integer Dim flag As

18、 Boolean = True i = TextBox1.Text j = 2 While j 5 Then k = a(i) a(i) = a(11 - i) a(11 - i) = k TextBox1.Text += a(11 - i).ToString + Else k = a(11 - i) a(11 - i) = a(i) a(i) = k TextBox1.Text += a(i).ToString + End If Next完整程序; Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Obje

19、ct, ByVal e As System.EventArgs) Handles Button1.Click Dim a(10), k As Integer For i = 1 To 10 a(i) = InputBox(请输入整数) TextBox1.Text += a(i).ToString + Next k = 0 TextBox1.Text += vbCrLf + 交换后： For i = 1 To 10 If i 5 Then k = a(i) a(i) = a(11 - i) a(11 - i) = k TextBox1.Text += a(11 - i).ToString + E

20、lse k = a(11 - i) a(11 - i) = a(i) a(i) = k TextBox1.Text += a(i).ToString + End If Next TextBox1.Text = 交换前： + TextBox1.Text End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End SubEnd Class第2题 元素平均编写程序，通过使用inputbox将10个整数放入一个一维数组中，然后计算这1

21、0个整数的平均值，在文本框中显示平均值和这10个数中低于平均值的数Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a(10), sum, i As Integer Dim av As Single For i = 1 To 10 a(i) = InputBox(请输入整数) sum += a(i) Next av = sum / 10 For i = 1 To 10 If a(i)

22、av Then TextBox1.Text += a(i).ToString + End If Next TextBox1.Text = 该组数的平均值为： + av.ToString + vbCrLf + 小于平均值的数有： + TextBox1.Text End SubEnd Class第3题 矩阵转置编写程序，实现矩阵转置，即矩阵的行、列互换，将一个3行4列的矩阵转换为4行3列，要示在文本框中分别显示转换前后的两个矩阵。提示: str = 交换前： + vbCrLf For i = 0 To 3 For j = 0 To 2 str += a(i, j).ToString() + b(j

23、, i) = a(i, j) Next str += vbCrLf Next str += 交换后: + vbCrLf For i = 0 To 2 For j = 0 To 3 str += b(i, j).ToString + Next str += vbCrLf Next完整程序:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a(,) As Integer = 1, 2, 3

24、, 4, 4, 5, 6, 7, 6, 7, 8, 9 Dim i, j, b(3, 2) As Integer, str As String str = 交换前： + vbCrLf For i = 0 To 2 For j = 0 To 3 str += a(i, j).ToString() + b(j, i) = a(i, j) Next str += vbCrLf Next str += 交换后： + vbCrLf For i = 0 To 3 For j = 0 To 2 str += b(i, j).ToString() + Next str += vbCrLf Next TextB

25、ox1.Text = str End SubEnd Class试验七:第1题 完全数编写程序，找出22000之间的所有完全数。完全数是指某个整数的每个因子之和正好等于该数本身，例如： 因为6=1+2+3，28=1+2+4+7+14，所以这两个数都是完全数。要求：（1）程序窗口界面及控件自行设计。 （2）单击“开始”按钮后，在文本框中显示求出的结果。（3） 请用进度条提示.Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

26、Button1.Click Dim a, b, c, d, i As Integer For a = 2 To 2000 c = 0 For b = 1 To a - 1 d = a Mod b If d = 0 Then c += b End If Next If a = c Then TextBox1.Text += a.ToString + End If ProgressBar1.Value = a Next End SubEnd Class第2题 杨辉三角形打印以下的杨辉三角形（打印10行）。11 11 2 11 3 3 11 4 6 4 11 5 10 10 5 1提示：（1）使用一

27、个二维数组a保存这些数据（2）第0列、主对角线上元素都为1（3）其它元素为其上一行元素与上一行左侧元素之和,即: a(I,j)=a(i-1,j)+a(i-1,j-1)Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a(10, 10) As Integer Dim i, j As Integer a(1, 1) = 1 For i = 2 To 10 a(i, 1) = 1 For j

28、 = 2 To i a(i, j) = a(i - 1, j - 1) + a(i - 1, j) Next Next For i = 1 To 10 For j = 1 To i TextBox1.Text += a(i, j).ToString + Next TextBox1.Text += vbCrLf Next End SubEnd Class第3题 求最小值建立一个4行3列的二维数组，找出其中最小的元素所在的行和列，并在文本框中输出该值及其行、列位置。Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a(,) As Integer = 45, 21, 13, 42, 15, 16, 37, 18, 29, 39, 51,