Question

Write a class called Book that has two private member variables called page (integer) and topic (string). It also has a static private member variable called count (integer). This class has only one constructor with default argument for page and topic. Write this constructor. Also overload the addition operator for this class such that it will add an integer value to the page variable of the book. For example when in main we say:

book2 = book1 + 4; then 4 will be added to the value of page. Also show how main can use the count variable to find out how many book objects are there.

The things that you should write:

1- class header defining member variables, addition operator overloading, setters, getters and constructor with default argument.

2- Implementation of constructor with default argument and the addition operator overloading as shown above.

Answer 1

#include <iostream>
#include <string>

using namespace std;

class Book {
private:
   int page;
   string topic;
public:
   static int count;
   Book();
   ~Book();
   void setPage(int p);
   void setTopic(string t);
   int getPage();
   string getTopic();
   Book &operator+(int num);
};

int Book::count = 0;

Book::Book() {
   count++;
   page = 0;
   topic = "";
}

Book::~Book() {
   count--;
}
void Book::setPage(int p) {
   page = p;
}
void Book::setTopic(string t) {
   topic = t;
}
int Book::getPage() {
   return page;
}
string Book::getTopic() {
   return topic;
}
Book &Book::operator+(int num) {
   page += num;
}

int main() {
   Book b1;
   Book b2;
   Book b;
   b.setPage(5);
   b.setTopic("topic");
   b = b+4;
   cout << "Page: " << b.getPage() << endl;
   cout << "Topic: " << b.getTopic() << endl;
   cout << Book::count << endl;
   return 0;
}

Page:9 Topic: topic Process exited after 0.1331 seconds with returnvalue 0 Press any key to continue - - -