Problem Statement

Multiple inheritance allows to specify that one class is a subclass of several other classes. Some languages allow multiple inheritance for arbitrary classes,   others restrict it to interfaces,   some don't allow it at all.

Write two classes (or interfaces) Camera and MobilePhone,   then write a class CameraPhone which is both a Camera and a MobilePhone. There is no need to implement any functions for those classes.

Let's start with the solution:

class Camera
  string cbuf
  method TakePhoto()
  end method
  method ViewPhoto()
  end method
end class

class MobilePhone
  string pbuf
  method MakeCall()
  end method
  method TakeCall()
  end method
end class

class CameraPhone
  has Camera,MobilePhone
end class

CameraPhone cp

cp.ViewPhoto
cp.MakeCall