Question

This is my last assignment in a programming class I had to take as a prerequisite for a database course (seems odd). The instructor has been awful and I haven't learned much of anything. I use VBA at work and just can't follow C++. I'm stuck on this assignment and have no idea what I'm doing. I'm a database guy at work, I'm not a programmer. Please help.

In C++, a program that performs the following tasks:

1.      Design a Book class that has three data members:

string title

int   pages

double price

2.      Add constructors and methods (as well as method parameters when necessary):

Book()         // constructor(s)

getBookInfo()   // print title, pages, price

setPrice()     // change price

3.      In the main() function, create two Book objects:

b1("C++ Programming", 834, 93.53)

b2("Data Structures", 217, 64.42)

4.      Change the price of b2 to 55.46 using the setPrice() method.

5.     Using cout, Print out book information using the getBookInfo() method as shown below:

C++ Programming 834 93.53

Data Structures 217 55.46

IN C++, a program that performs the following tasks:

1.      Derive a TextBook class (child) from the Book class (parent).

2.      Add new data members:

string school

double discount

3.      Add new constructors and methods (as well as method parameters when necessary):

TextBook()           // constructor(s)

compTextBookPrice()  // price = price - discount

4.      Override inherited methods:

getBookInfo()        // print title, pages, price, school, discount

5.      In the main() function, create two Book objects and two TextBook objects:

b1("C++ Programming", 834, 93.53)

b2("Data Structures", 217, 64.42)

tb1("Database", 365, 74.41, "YSU", 20.00)

tb2("Networks", 522, 92.58, "YSU", 20.00)

6.      Using cout, print out book information as shown below:

C++ Programming  834  93.53

Data Structures  217  64.42

Database         365  54.41 YSU 20.00

Networks         522  72.58 YSU 20.00

Answer 1

check out the solution and do comment for any queries.

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

#include <iostream>

using namespace std;

class Book
{
private:
string title;
int pages;
double price;
public:
// default constructor - initialize with default values
Book()
{
title = " ";
pages = 0;
price = 0.0;
}
// parameterized constructor - initialized with given values
Book(string t, int pg, double p)
{
title = t;
pages = pg;
price = p;
}
// print title , pages, price
void getBookInfo()
{
cout << "\n" << title << "\t" << pages << "\t" << price;
}
// pass the value of changed price
void setPrice(double p)
{
price = p;
}
};

int main() {
// 2 book objects
Book b1("C++ Programming", 834, 93.53);
Book b2("Data Structures", 217, 64.42);
// change the price of b2
b2.setPrice(55.46);
// print the information
b1.getBookInfo();
b2.getBookInfo();
}

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

code :

----------

Output ::

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

Program extension with Inheritance concept.

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

#include <iostream>
#include <iomanip>

using namespace std;

class Book
{
public:
string title;
int pages;
double price;
public:
// default constructor
Book()
{
title = " ";
pages = 0;
price = 0.0;
}
// parameterized constructor
Book(string t, int pg, double p)
{
title = t;
pages = pg;
price = p;
}
// print title , pages, price
void getBookInfo()
{
cout << "\n" << title << "\t" << pages << "\t" << price;
}
// pass the value of changed price
void setPrice(double p)
{
price = p;
}
};

// child class
class TextBook : public Book
{
public:
// class members
string school;
double discount;
public:
// default constructor
TextBook() : Book()
{
school = " ";
discount = 0.0;
}
// parameterized constructor - call the super class constructor as shown below passing required parameters to initialize
TextBook(string t, int pg, double p, string s, double d) : Book(t, pg, p)
{
school = s;
discount = d;
}
// computes the price after deducting discount
void compTextBookPrice()
{
price = price - discount;
}
// override inherit methods
void getBookInfo()
{
cout << "\n" << title << "\t" << pages << "\t" << price << "\t" << school << "\t" << discount;
}
};

int main() {
// 2 book objects
Book b1("C++ Programming", 834, 93.53);
Book b2("Data Structures", 217, 64.42);
// 2 textbook objects
TextBook tb1("Database", 365, 74.41, "YSU", 20.00);
TextBook tb2("Networks", 522, 92.58, "YSU", 20.00);
  
// print the information
b1.getBookInfo();
b2.getBookInfo();
  
cout << fixed << showpoint << setprecision(2); // to print 2 digits after decimal point
// compute the price after discount by a function call
tb1.compTextBookPrice();
tb2.compTextBookPrice();
// print information of textbook
tb1.getBookInfo();
tb2.getBookInfo();
}

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

code :

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

OUTPUT ::