CSE294B
Object
-
Oriented C++ Programming for Engineers
Object
-
Oriented
C++
Programming
for
Engineers
Lecture #5
Jeffrey Miller, Ph.D.
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Object-Oriented Programming with C++: Understanding Objects, Classes, and Bank Accounts - , Study notes of Engineering
A lecture note from cse294b, object-oriented c++ programming for engineers, focusing on the concept of objects and classes using the example of a bank account. The lecture covers the minimum requirements to operate a car as an object analogy, the difference between objects and classes, the data and functions associated with a bank account object, and access specifiers in c++ for encapsulation. The document also includes a simple bank_account class implementation and a call to action for a programming exercise.
Typology: Study notes
2009/2010
1 / 10
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CSE294B
Object-Oriented C++ Programming for EngineersObject-Oriented C++ Programming for Engineers
Lecture
Jeffrey Miller, Ph.D.
Object Analogy
-^
To drive a car, you need the accelerator pedal, thebrake pedal, the steering wheel, and the ignition(at minimum)(at minimum)
-^
But what actually happens when you turn the keyin the ignition?
M
d i
d^
k^
b^
h^
d^
d
- Most drivers do not know, but they do not need to
know to be able to drive the car
-^
This is the idea behind objects
j
- The code that uses the object knows
what
the function
will do, but does not need to know
how
it does it
Object Descriptions
• Objects (and in turn, classes) can be
described by two key features
y
y
- Data– Functions
Functions
• The functions of an object operate on the
data that is part of the object or data that isdata that is part of the object or data that ispassed into the function (possibly inconjunction with the data of the object)conjunction with the data of the object)
Bank Account Object
•^
What is the data that is associated with a bank account?–
NameA
t N
b
-^
Account Number
-^
Balance
-^
PIN
•^
What are the functions that can be performed on a bankaccount?
Deposit
-^
Deposit
-^
Withdrawal
-^
Transfer
-^
Check Balance
-^
Change PIN
Access Specifiers
•^
There are two access specifiers in C++–
public
i^
t
-^
private
•^
If a variable or function is declared public, any other pieceof code can access the variable or function
-^
If a variable or function is declared private, only the classin which that variable or function is declared can access it
l^
f^
h^
b^
id
h^
d^
d^
h
•^
Rule of Thumb – Hide the data and expose the necessaryfunctions
Encapsulation
• A class is considered
encapsulated
if all of
the data is declared private
p
• A class is considered
fully encapsulated
if
all of the data is declared private AND youall of the data is declared private AND youprovide an accessor (getter) andmanipulator (setter) function for each piecemanipulator (setter) function for each pieceof data
Manipulators are also called mutators
- Manipulators are also called mutators