OOPs 3rd Solution

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Q3:    

     Start with the publication, book, and tape classes of Exercise 1. Add a base class sales that holds an array of three floats so that it can record the dollar sales of a particular publication for the last three months. Include a getdata() function to get three sales amounts from the user, and a putdata() function to display the sales figures. Alter the book and tape classes so they are derived from both publication and sales. An object of class book or tape should input and output sales data along with its other data. Write a main() function to create a book object and a tape object and exercise their input/output capabilities?

Ans:

///Syed Syab Ahmad Shah

#include<iostream>

using namespace std;

class publication

{

protected:

string name;

int price;

public:

string N;

int p;

void input()

{

cout<<"Enter title of the BOOK: ";

cin>>N;

cout<<"Enter price of the BOOK: ";

cin>>p;

name = N;

price = p;

}

void output()

{

cout<<"Title of the BOOK: "<<name<<endl;

cout<<"Price of the BOOK: "<<price<<endl;

}

};

class sale

{

public:

int s1, s2, s3;

void input()

{

cout<<"Enter the 1st month sale: ";cin>>s1;

cout<<"Enter the 2nd month sale: ";cin>>s2;

cout<<"Enter the 3rd month sale: ";cin>>s3;

}

void output()

{

cout<<"1st month sale: "<<s1<<endl;

cout<<"2nd month sale: "<<s1<<endl;

cout<<"3rd month sale: "<<s1<<endl;

}

};

class books:public publication, public sale

{

public:

int page_count;

void input()

{

publication::input();

sale::input();

cout<<"Enter number of pages: ";cin>>page_count;

}

void output()

{

publication::output();

sale::output();

cout<<"Number of pages: "<<page_count<<endl;

}

};

class tape:public publication, public sale

{

public:

int timer;

void input()

{

publication::input();

sale::input();

cout<<"time of audio: ";cin>>timer;

}

void output()

{

publication::output();

sale::output();

cout<<"Time of audio: "<<timer;

}

};

int main()

{

books B;

tape T;

B.input();

B.output();

T.input();

T.output();

return 0;

}