Imports System
Namespace December_19th
Class Teacher
Inherits Person
Private subject As String
Public Sub Explain()
Console.WriteLine("Explanation begins")
End Sub
End Class
End Namespace
Namespace December_19th
Class StudentAndTeacherTest
Private Shared Sub Main()
Dim debug As Boolean = False
Dim myPerson As Person = New Person()
myPerson.Greet()
Dim myStudent As Student = New Student()
myStudent.SetAge(21)
myStudent.Greet()
myStudent.ShowAge()
Dim myTeacher As Teacher = New Teacher()
myTeacher.SetAge(30)
myTeacher.Greet()
myTeacher.Explain()
If debug Then Console.ReadLine()
End Sub
End Class
End Namespace
Namespace December_19th
Class Student
Inherits Person
Public Sub ShowAge()
Console.WriteLine("My age is: {0} years old", age)
End Sub
End Class
End Namespace
Namespace December_19th
Class Person
Protected age As Integer
Public Sub Greet()
Console.WriteLine("Hello")
End Sub
Public Sub SetAge(ByVal n As Integer)
age = n
End Sub
End Class
End Namespace