VB虽说不再是当今编程语言的主流，但VB所拥有图形用户界面（GUI）和快速应用程序开发（RAD）系统，可以让我们轻松的使用VB提供的组件快速建立一个应用程序。下面我们一起来做一个小程序，回味经典。
界面设计：
程序运行效果图
各项参数设置
代码设计：
Public Class Form1
Dim a As Single, p As Single
Dim b As Single, s As Single
Dim c As Single
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
a = Val(TextBox1.Text)
b = Val(TextBox2.Text)
c = Val(TextBox3.Text)
p = (a + b + c) / 2
s = Math.Sqrt(p * (p - a) * (p - b) * (p - c))
TextBox4.Text = Str(s)
End Sub
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
End Sub
Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles TextBox2.TextChanged
End Sub
Private Sub TextBox3_TextChanged(sender As Object, e As EventArgs) Handles TextBox3.TextChanged
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
TextBox1.Text = ""
TextBox2.Text = ""
TextBox3.Text = ""
TextBox4.Text = ""
End Sub
Private Sub TextBox4_TextChanged(sender As Object, e As EventArgs) Handles TextBox4.TextChanged
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
End
End Sub
End Class
运行结果：
运行结果图
最后多说一句，没有过时的程序语言，只要能满足工作需要就是好的语言。