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Task/Abstract-type/FreeBASIC/abstract-type.freebasic

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+' FB 1.05.0 Win64
+
+Type Animal Extends Object
+  Declare Abstract Sub MakeNoise()
+End Type
+
+Type Bear Extends Animal
+  name As String
+  Declare Constructor(name As String)
+  Declare Sub MakeNoise()
+End Type
+
+Constructor Bear(name As String)
+  This.name = name
+End Constructor
+
+Sub Bear.MakeNoise()
+  Print name; " is growling"
+End Sub
+
+Type Dog Extends Animal
+  name As String
+  Declare Constructor(name As String)
+  Declare Sub MakeNoise()
+End Type
+
+Constructor Dog(name As String)
+  This.name = name
+End Constructor
+
+Sub Dog.MakeNoise()
+  Print name; " is barking"
+End Sub
+
+Dim b As Animal Ptr = New Bear("Bruno")
+b -> MakeNoise()
+Dim d As Animal Ptr = New Dog("Rover")
+d -> MakeNoise()
+Delete b
+Delete d
+Print
+Print "Press any key to quit program"
+Sleep