Creating a class which uses the concept of inheritance, displays data and data members and uses the concept of exception handling using the C++ language.

 Problem statement:

        Imagine a publishing company which does marketing for book and audio Cassette Versions. Create a class publication that stores the title (a string) and price (type float) of publications from this class derive two classes: book which adds. a page count (type int) and tape which adds a playing time in minutes (type float). Write a Program that instantiates the book and tape class, allows user to enter data and displays the data members. If an exception is caught, replace all the data member values, with Zero Values.

Objectives:

       To learn the concept of inheritance and exception handling.

Algorithm:

1. Start
2. Create classes Publication book and tape.
3. Publication class having data member title, price.
4. Class Book having data members pages and member functions getData() and putData().
5. Class Tape having data members minutes and member functions getData() and putData().
6. Create an object book class book and object of classtape.
7. Stop.

Program:

# include<iostream>

# include<string.h>

using namespace std;

class publication // declaring class Publication

{

private:

            string title;

            float price;

public:

            void add()

            {

                        cout << "\nEnter the Publication information : " << endl;

                        cout << "Enter Title of the Publication : ";

                        cin.ignore();

                        getline(cin, title);

                        cout << "Enter Price of Publication : ";

                        cin >> price;

            }

            void display()

            {

                        cout << "\n--------------------------------------------------";

                        cout << "\nTitle of Publication : " << title;

                        cout << "\nPublication Price : " << price;

            }

};

class book : public publication // declaring class book which inherits class publication in public mode.

{

private:

            int page_count;

public:

            void add_book()

            {

            try

            {

                        add();

                        cout << "Enter Page Count of Book : ";

                        cin >> page_count;

                        if (page_count <= 0)

                        {

                                    throw page_count;

                        }

            }

            catch(...)

            {

                        cout << "\nInvalid Page Count!!!";

                        page_count = 0;

            }

            }

            void display_book()

            {

                        display();

                        cout << "\nPage Count : " <<page_count;

                        cout << "\n--------------------------------------------------\n";

            }

};

class tape : public publication // declaring class tape which inherits class publication in public mode

{

private:

            float play_time;

public:

            void add_tape()

{

try

{

            add();

            cout << "Enter Play Duration of the Tape in minutes:";

            cin >> play_time;

            if (play_time <= 0)

            throw play_time;

}

catch(...)

{

            cout << "\nInvalid Play Time!!!";

            play_time = 0;

}

}

void display_tape()

{

            display();

            cout << "\nPlay Time : " <<play_time << " min";

            cout << "\n--------------------------------------------------\n";

}

};

int main()

{

            book b1[10]; // object of class book

            tape t1[10]; // object of class tape

            int ch, b_count = 0, t_count = 0;

            do

            {

                        cout << "\n* * * * * PUBLICATION DATABASE SYSTEM * * * * *";

                        cout << "\n--------------------MENU-----------------------";

                        cout << "\n1. Add Information to Books";

                        cout << "\n2. Add Information to Tapes";

                        cout << "\n3. Display Books Information";

                        cout << "\n4. Display Tapes Information";

                        cout << "\n5. Exit";

                        cout << "\n\nEnter your choice : ";

                        cin >> ch;

                        switch(ch)

                        {

                        case 1:

                                    b1[b_count].add_book();

                                    b_count ++;

                                    break;

                        case 2:

                                    t1[t_count].add_tape();

                                    t_count ++;

                                    break;

                        case 3:

                                    cout << "\n* * * * BOOK PUBLICATION DATABASE SYSTEM * * * *";

                                    for (int j=0;j < b_count;j++)

                                    {

                                                b1[j].display_book();

                                    }

                                    break;

                        case 4:

                                    cout << "\n* * * * TAPE PUBLICATION DATABASE SYSTEM * * * *";

                                    for (int j=0;j < t_count;j++)

                                    {

                                                t1[j].display_tape();

                                    }

                                    break;

                        case 5:

                                    exit(0);

                        }

            }while (ch != 5);

return 0;

}

Output:

* * * * * PUBLICATION DATABASE SYSTEM * * * * *

--------------------MENU-----------------------

1. Add Information to Books

2. Add Information to Tapes

3. Display Books Information

4. Display Tapes Information

5. Exit

 

Enter your choice : 1

 

Enter the Publication information :

Enter Title of the Publication : Object Oriented Programing

Enter Price of Publication : 360

Enter Page Count of Book : 410

 

* * * * * PUBLICATION DATABASE SYSTEM * * * * *

--------------------MENU-----------------------

1. Add Information to Books

2. Add Information to Tapes

3. Display Books Information

4. Display Tapes Information

5. Exit

 

Enter your choice : 2

 

Enter the Publication information :

Enter Title of the Publication : Storytel

Enter Price of Publication : 250

Enter Play Duration of the Tape in minutes:280

 

* * * * * PUBLICATION DATABASE SYSTEM * * * * *

--------------------MENU-----------------------

1. Add Information to Books

2. Add Information to Tapes

3. Display Books Information

4. Display Tapes Information

5. Exit

 

Enter your choice : 3

 

* * * * BOOK PUBLICATION DATABASE SYSTEM * * * *

--------------------------------------------------

Title of Publication : Object Oriented Programing

Publication Price : 360

Page Count : 410

--------------------------------------------------

 

* * * * * PUBLICATION DATABASE SYSTEM * * * * *

--------------------MENU-----------------------

1. Add Information to Books

2. Add Information to Tapes

3. Display Books Information

4. Display Tapes Information

5. Exit

 

Enter your choice : 4

 

* * * * TAPE PUBLICATION DATABASE SYSTEM * * * *

--------------------------------------------------

Title of Publication : Storytel

Publication Price : 250

Play Time : 280 min

--------------------------------------------------

 

* * * * * PUBLICATION DATABASE SYSTEM * * * * *

--------------------MENU-----------------------

1. Add Information to Books

2. Add Information to Tapes

3. Display Books Information

4. Display Tapes Information

5. Exit

 

Enter your choice : 5

 

--------------------------------

Process exited after 130.7 seconds with return value 0

Press any key to continue . . .

Conclusion:

Hence, we have successfully understand the Concept of Inheritance and exception handling.