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1、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 Sub Private Su
2、b 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.Click Dim a, b
3、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 TextBox3.Text = a /
4、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 System.EventAr
5、gs) 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 = X2= & (-b - Ma
6、th.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 System.Object, ByVal
7、 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 RadioButton1_CheckedChange
8、d(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.ForeColor = Color.
9、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.EventArgs) Handles R
10、adioButton4.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 System.Object,
11、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 Form1 Private S
12、ub 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计。Public Class
13、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()
