大学计算机VB程序设计考试题目.doc
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大学计算机 VB 程序设计考试题目
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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 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.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
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