1. CSC241: Object Oriented Programming
Lecture No 24

2. Previous Lecture Efficient string class Dynamic Type Information
Resolve problem while deleting String objects
Dynamic Type Information
dynamic_cast operator
Checking class type
pDerv1 = dynamic_cast<Derv1*>(pUnknown)
Changing Pointer Types
typeid operator
Class name of object

3. Today’s Lecture Example programs Intro to Generic Programming
Publication company
Distance class
Intro to Generic Programming
template

4. Example program 1
Imagine the publishing company that markets both book and audiocassette versions of its works
create a class publication (private data: title, price)
derive two classes:
book, which adds a page count (type int)
tape, which adds a playing time in minutes (type float)
Each of the three classes should have a getdata() function to get its data from the user at the keyboard, and a putdata() function to display the data
Write a main() program that creates an array of pointers to publication

5. Cont.
In a loop, ask the user for data about a book or tape, and use new to create an object of type book or tape
When the user has finished entering the data display the resulting data using a for loop and a single statement such as
pubarr[j]->putdata();
Write a program

6. Example program 2
In the Distance class, create an overloaded * operator so that two distances can be multiplied together. Make it a friend function so that you can use such expressions as
dist1 = 7.5 * dist2;
Write a main() program to test this operator.
Write a program