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Object-Oriented Programming

Using C++

CLASS 1

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• Review of Syllabus• Catalog Description

– An introduction to object oriented programming techniques using C++ programming language. Topics covered will include classes, both single and multiple inheritance, templates, polymorphism, exception handling and file processing.

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• Review of Syllabus• Textbook

Data Abstraction & Problem Solving with C++ by Frank Carrano, 5th edition

• InstructorKamran KhanOffice Hours kkhan@engr.smu.edu

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• Review of Syllabus• Catalog Description• Course Requirements and Method of

Evaluation–Test #1 125–Test #2 125–Test #3 125–Homework 10 each–Programs 30 each– Pop Quizzes 15 each–Project 100

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• Grading Example• 1200 possible points• Highest score of 1150• You collected 920

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• Grading Example• 1200 possible points• Highest score of 1150• You collected 920

9201150

x100=

1150 920009200

80 B

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• Course Competencies• Use the C++ preprocessor• Explain the use of

overloading operators• Design and code an

inheritance hierarchy

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• Course Competencies• Explain the use of overloading of

function names• Create a library of functions which

can process data as objects• Understand memory management

and dynamic allocation• Use a virtual function to

demonstrate polymorphism

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• Course Competencies• Demonstrate a knowledge of an “is a”

and “has a” relationship between classes

• Write a C++ program using sequential and random file processing

• Use exception handling techniques• Write a class template and a driver to

use it

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Assignments

L: Programs due Monday 10pm of the week assigned, uploaded into your Blackboard folder the following files:All source (.cpp) filesUML filesAll header (.h) filesExecutable (.out) file

H: Homework due at the beginning of class lecture, Thursday, can be hand-written

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Late Assignments

Homework assignments will not be accepted late

Labs (programs) can be turned in the 48 hours late, by special permission/request for a late folder approved by instructor; 10 late points will be deducted.

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Explanation of Transmission of Assignments

• Programming assignments will be submitted via Blackboard

• Next week’s lab will take you through the requirements for Blackboard, Unix logins, Unix executable files, and other information related to your programming assignmentsATTENDANCE IS MANDATORY

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Scholastic Dishonesty Policy

• Outside assistance other than from your ta, instructor, or university tutoring service is considered scholastic dishonesty

• Looking at/copying from another student’s work is considered scholastic dishonesty

• A single incident results in a zero for that work for yourself and the person you copied from; multiple incidents results in an F in the class and a report to the Honors Council

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Introduction to C++ Classes

• Encapsulation combines an ADT’s data with its operations to form an object • An object is an instance of a class• A class defines a new data type• A class contains data members and

methods (member functions)• By default, all members in a class are

private– But you can specify them as public

• Encapsulation hides implementation details

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C++ Classes

Figure 3-10An object’s data and methods are encapsulated

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C++ Classes vs Java classes

• Each class definition is placed in a header file• Classname.h

• The implementation of a class’s methods are placed in an implementation file• Classname.cpp

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C++ Classes: The header file/** @file Sphere.h */const double PI = 3.14159;class Sphere{public: Sphere(); // Default constructor Sphere(double initialRadius);

// Constructor void setRadius(double newRadius); double getRadius() const;

// can’t change data members double getDiameter() const; double getCircumference() const; double getArea() const;

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C++ Classes: The header file

double getVolume() const; void displayStatistics() const;private: double theRadius; // data members should be private}; // end Sphere interface file

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C++ Classes: Constructors

• Constructors• Create and initialize new instances of a class

– Invoked when you declare an instance of the class• Have the same name as the class• Have no return type, not even void

• A class can have several constructors• A default constructor has no arguments• The compiler will generate a default constructor

if you do not define any constructors

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C++ Classes: Constructors

• The implementation of a method qualifies its name with the scope resolution operator ::

• The implementation of a constructor• Sets data members to initial values

– Can use an initializer Sphere::Sphere() : theRadius(1.0) { } // end default constructor

• Cannot use return to return a value

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C++ Classes: Destructors• Destructor

• Destroys an instance of an object when the object’s lifetime ends

• Each class has one destructor• For many classes, you can omit the

destructor• The compiler will generate a destructor if

you do not define one– For now, we will use the compiler’s

destructor

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C++ Classes: The implementation file/** @file Sphere.cpp */#include <iostream>#include "Sphere.h" // header fileusing namespace std;Sphere::Sphere() : theRadius(1.0){} // end default constructorSphere::Sphere(double initialRadius){ if (initialRadius > 0) theRadius = initialRadius; else theRadius = 1.0;} // end constructor

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C++ Classes: The implementation filevoid Sphere::setRadius(double newwRadius){ if (newRadius > 0) theRadius = newRadius; else theRadius = 1.0;} // end setRadius

• The constructor could call setRadius

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C++ Classes: The implementation file

double Sphere::getRadius() const{ return theRadius;} // end getRadius. . .

double Sphere::getArea() const{ return 4.0 * PI * theRadius *

theRadius;} // end getArea. . .

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C++ Classes: Using the class Sphere

#include <iostream>#include "Sphere.h" // header fileusing namespace std;A mechanism for logically grouping declarations and

definitions into a common declarative region• Items declared in the C++ Standard Library are declared

in the std namespace• You include files for several functions declared in the std

namespace • To include input and output functions from the C++

library, write #include <iostream>using namespace std;

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C++ Classes: Using the class Sphere

int main() // the client{ Sphere unitSphere; Sphere mySphere(5.1); cout << mySphere.getDiameter() << endl; // C++’s version of screen output // more on cout later} // end main

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Q & A