This document discusses classes and objects in C++. It contains self-review questions about classes, structures, objects, member functions, and static data members. It also provides two programming questions: (1) Write a class to represent a vector with member functions to create, modify, multiply, and display a vector. (2) Create classes to store distances in different units and use a friend function to add objects from different classes, displaying the output in the appropriate units.

1. Tutorial 5
Classes and Objects
Self Review Questions
1. What are classes? How does it help in data hiding?
2. How structures in c are different from structures in C++?
3. What do you mean by visibility labels?
4. Differentiate between
a. Classes and Structures
b. Class and Object
c. Member Function and Non Member Function
d. Member function and Friend function
5. How memory is allocated to Objects and static data members?
6. Give an example to illustrate the use array of objects.
7. Illustrate the use of scope resolution operator as class scope operator.
Programming Questions
1. Write a class to represent a vector (a series of float values). Include member functions
to perform the following tasks:
(a) To create the vector
(b) To modify the value of a given element
(c) To multiply by a scalar value
(d) To display the vector in the form (10, 20, 30.....)
Write a program to test your class.
2. Create two classes DM and DB which store the value of distances. DM stores distances in
metres and centimetres and DB in feet and inches. Write a program that can read values
for the class objects and add one object of DM with another object of DB.
Use a friend function to carry out the addition operation. The object that stores the results
may be a DM object or DB object, depending on the units in which the results are
required. The display should be in the format of feet and inches or metres and centimetres
depending on the object on display.