Test Your Knowledge: Exercises
Exercise 11-1. Create a base class, Telephone
, and derive a class ElectronicPhone
from it. In Telephone
, create a protected string member phonetype
and a public method Ring( )
which outputs a text message such as this: “Ringing the <phonetype>.” In ElectronicPhone
, the constructor should set the phonetype
to “Digital.” In the Run( )
method, call Ring( )
on the ElectronicPhone
to test the inheritance.
Exercise 11-2. Extend Exercise 11-1 to illustrate a polymorphic method. Have the derived class override the Ring( )
method to display a different message.
Exercise 11-3. Change the Telephone
class to abstract, and make Ring( )
an abstract method. Derive two new classes from Telephone
: DigitalPhone
and TalkingPhone
. Each derived class should set the phonetype
, and override the Ring( )
method.
Exercise 11-4. Phones these days do a lot more than ring, as you know. Add a method to DigitalPhone
called VoiceMail( )
that outputs the message “You have a message. Press Play to retrieve.” Now add a new class, DigitalCellPhone
, that derives from DigitalPhone
and implements a version of VoiceMail( )
that outputs the message “You have a message. Call to retrieve.”
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