Question

c++ Error after oveloading, please help?

LAB #8- CLASSES REVISITED &&    Lab #8.5 …      Jayasinghe De Silva

Design and Implement a Program that will allow all aspects of the Class BookType to work properly as defined below:

class bookType

{

public:

   void setBookTitle(string s);

           //sets the bookTitle to s

   void setBookISBN(string ISBN);

           //sets the private member bookISBN to the parameter

   void setBookPrice(double cost);

           //sets the private member bookPrice to cost

   void setCopiesInStock(int noOfCopies);

           //sets the private member copiesInStock to noOfCopies

    void printInfo() const;

           //prints the bookTitle, bookISBN, the bookPrice and the       //copiesInStock

   string getBookISBN() const;

           //returns the bookISBN

    double getBookPrice() const;

           //returns the bookPrice

    int showQuantityInStock() const;

           //returns the quantity in stock

    void updateQuantity(int addBooks);

           // adds addBooks to the quantityInStock, so that the quantity //in stock now has it original

       // value plus the parameter sent to this function

private:

   string bookName;

   string bookISBN;

   double price;

   int quantity;

};

You MUST ALSO add TWO CONSTRUCTORS for the class above.

(1)    One is the DEFAULT CONSTRUCTOR

(2)    The other (#2) is a Constructor that takes four parameters and sets the INITIAL values for the bookName, bookISBN, price, and quantity parameters.

LAB # 8.5

ADD AN OPERATOR OVERLOADING >= TO COMPARE quantity (the private data member in the bookType Class.

#include <iostream>

#include <cstring>

using namespace std;

class bookType

{

private:

string bookName;

string bookISBN;

double price;

int quantity;

public:

bookType() {                       //Default const

cout << "Default Constructor Called" << endl;

}

//Four Parameter Const bellow

bookType(string bookName, string bookISBN, double price, int quantity) {

this -> bookName = bookName;

this -> bookISBN = bookISBN;

this -> price = price;

this -> quantity = quantity;

}

void setBookTitle(string s) {

bookName = s;

}

//sets the bookTitle to s

void setBookISBN(string ISBN) {

bookISBN = ISBN;

}

//sets the private member bookISBN to the parameter

void setBookPrice(double cost) {

this->price = cost;

}

//sets the private member bookPrice to cost

void setCopiesInStock(int noOfCopies) {

this->quantity = noOfCopies;

}

//sets the private member copiesInStock to noOfCopies

void printInfo() {

cout << "Book Name " << bookName << endl;

cout << "Book ISBN " << bookISBN << endl;

cout << "Price " << price << endl;

cout << "Quantity " << quantity << endl;

}

//prints the bookTitle, bookISBN, the bookPrice and the //copiesInStock

string getBookISBN() {

return this->bookISBN;

}

//returns the bookISBN

double getBookPrice() {

return price;

}

//returns the bookPrice

int showQuantityInStock() {

return quantity;

}

//returns the quantity in stock

void updateQuantity(int addBooks) {

quantity += addBooks;

}

// adds addBooks to the quantityInStock, so that the quantity //in stock now has it original

// value plus the parameter sent to this function

string operator <(const bookType& bk) {

if(quantity < bk.quantity) return "Second Object quanity is greater than first one";

else if(bk.quantity < quantity) return "First Object quantity is greater than second one";

else return "Both quantity are equal";

}

// Comparison operator overloading

};

87 88 Comparison operator overloading 89 itors are website. く 90 001. BON input Compilation failed due to following error(s) main.cpp:86:1: error: expected ' at end of input main.cpp:86:1: error: expected unqualified-id at end of input

Answer 1

Code:

#include <iostream>

#include <cstring>

using namespace std;

class bookType

{

private:

string bookName;

string bookISBN;

double price;

int quantity;

public:

bookType()

{ //Default const

cout << "Default Constructor Called" << endl;

}

//Four Parameter Const bellow

bookType(string bookName, string bookISBN, double price, int quantity)

{

this -> bookName = bookName;

this -> bookISBN = bookISBN;

this -> price = price;

this -> quantity = quantity;

}

void setBookTitle(string s)

{

bookName = s;

}

//sets the bookTitle to s

void setBookISBN(string ISBN) {

bookISBN = ISBN;

}

//sets the private member bookISBN to the parameter

void setBookPrice(double cost) {

this->price = cost;

}

//sets the private member bookPrice to cost

void setCopiesInStock(int noOfCopies) {

this->quantity = noOfCopies;

}

//sets the private member copiesInStock to noOfCopies

void printInfo() {

cout << "Book Name " << bookName << endl;

cout << "Book ISBN " << bookISBN << endl;

cout << "Price " << price << endl;

cout << "Quantity " << quantity << endl;

}

//prints the bookTitle, bookISBN, the bookPrice and the //copiesInStock

string getBookISBN() {

return this->bookISBN;

}

//returns the bookISBN

double getBookPrice() {

return price;

}

//returns the bookPrice

int showQuantityInStock() {

return quantity;

}

//returns the quantity in stock

void updateQuantity(int addBooks) {

quantity += addBooks;

}

// adds addBooks to the quantityInStock, so that the quantity //in stock now has it original

// value plus the parameter sent to this function

int operator >=(const bookType& bk) {

if(quantity >= bk.quantity) return 1;

else if(bk.quantity >= quantity) return -1;

else return 0;

}

// Comparison operator overloading

//integer can be returned to the main function

};

int main()

{

bookType b1; //default constructor

int result;

bookType b2("harry potter","jp123",250,5); //parameterized constructor

b1.setBookTitle("Half Girlfriend");

b1.setBookISBN("hg123");

b1.setBookPrice(280);

b1.setCopiesInStock(12);

cout<<endl;

cout<<"First book details:"<<endl;

b1.printInfo();

cout<<endl;

cout<<"Second book details:"<<endl;

cout<<"Book ISBN "<<b2.getBookISBN()<<endl;

cout<<"Price "<<b2.getBookPrice()<<endl;

cout<<"Quantity "<<b2.showQuantityInStock()<<endl;

b2.updateQuantity(10); //updating quantity of second book i.e. adding 10 more books

cout<<endl<<"After Updating Second Book....."<<endl<<endl;

b2.printInfo();

cout<<endl;

result=b1>=b2; //int result stores the value from the operator overloaded function

if(result>0) //result is checked and accordingly the statement is printed

{

cout<<"First Book Quantity is more";

}

else if(result<0)

{

cout<<"Second Book Quantity is more";

}

else

{

cout<<"Both Books have same Quantity";

}

return 0;

}

Output: