GroupA_Practical3.cpp

/*
Imagine a publishing company which does marketing for book
and audiocassette versions.
 Create a class publication that stores the title (a string)
and price (type float) of a
 publication.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 classes,
allows user to enter data and
 displays the data members.If an exception is caught, replace
all the data member values
 with zero values.
*/

# include<iostream>
# include<stdio.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 : ";
 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;
 }