Q3: Imagine a publishing company that markets both book and audio cassette versions. Create a class called Publication that stores the title (a string) and price (a float) of the publications. From this class, derive two classes: Book, which adds a page_count attribute (an integer), and Tape, which adds a playing_time attribute in minutes (a float). Write a program that instantiates the Book and Tape classes, allows the user to enter data for each class, and then displays the data members. If an exception occurs, set all data member values to zero.

Publication Class

Solution and implementation for Q3 from Object-Oriented Programming (oop).

grpA_3.c++ Download

#include <iostream>
#include <stdio.h>
using namespace std;

class publication {
private:
    string title;
    float price;

public:
    void add() {
        cout << "Enter Title: ";
        cin.ignore();
        getline(cin, title);
        cout << "Enter Price: ";
        cin >> price;
    }

    void display() {
        cout << "Title: " << title << endl;
        cout << "Price: " << price << endl;
    }
};

class book : public publication {
private:
    int page_count;

public:
    void add_book() {
        try {
            add();
            cout << "Enter Pages: ";
            cin >> page_count;
            if (page_count <= 0) {
                throw page_count;
            }
        }
        catch (...) {
            cout << "Invalid page count!" << endl;
            page_count = 0;
        }
    }

    void display_book() {
        display();
        cout << "Pages: " << page_count << endl;
    }
};

class tape : public publication {
private:
    float play_time;

public:
    void add_tape() {
        try {
            add();
            cout << "Enter Play Time (minutes): ";
            cin >> play_time;
            if (play_time <= 0)
                throw play_time;
        }
        catch (...) {
            cout << "Invalid play time!" << endl;
            play_time = 0;
        }
    }

    void display_tape() {
        display();
        cout << "Play Time: " << play_time << " min" << endl;
    }
};

int main() {
    book b1[10];
    tape t1[10];
    int ch, b_count = 0, t_count = 0;

    do {
        cout << "* PUBLICATION DATABASE *" << endl;
        cout << "1. Add Book" << endl;
        cout << "2. Add Tape" << endl;
        cout << "3. Show Books" << endl;
        cout << "4. Show Tapes" << endl;
        cout << "5. Exit" << endl;
        cout << "Enter 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 << "* BOOKS *" << endl;
            for (int j = 0; j < b_count; j++) {
                b1[j].display_book();
            }
            break;
        case 4:
            cout << "* TAPES *" << endl;
            for (int j = 0; j < t_count; j++) {
                t1[j].display_tape();
            }
            break;
        case 5:
            exit(0);
        default:
            cout << "Invalid choice!" << endl;
        }
    } while (ch != 5);

    return 0;
}

Group A

Publication Class

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