I have the following program that declares 100 Book objects... The way that I have it now, each item in the array is set to a default value. Is there a way to add only the items that are input by the user to the array? and not start off with 100 "John Doe" instances?
here is the code...
#include <ostream>
using namespace std;
class Book
{
private:
string title;
string authorLastName;
string authorFirstName;
int year;
public:
Book(); // The default constructor
// The default constructor sets the title to ìunknownî,
// the author to ìJohn Doeî, and the year to 0
Book(string, string, string, int);
Book(const Book& source); // The copy constructor
// Mutator functions
void setTitle(string);
void setAuthor(string, string);
bool setYear(int); // A valid year is any year from
// 1500 and 2009. The function will set a valid year to the year
// member variable and return true. It not do the set on an invalid
// year, and return false.
// Accessor functions
string getTitle();
string getAuthorLastName();
string getAuthorFirstName();
int getYear();
bool operator==(const Book & right);
};#include <iostream>
using namespace std;
#include <string>
#include "Book.h"
#include <ostream>
Book::Book()
{
title = "Unknown";
authorLastName = "Doe";
authorFirstName = "John";
year = 1500;
}
Book::Book(string ti, string ln, string fn, int yr)
{
title = ti;
authorLastName = ln;
authorFirstName = fn;
year = yr;
}
Book::Book(const Book& source)
{
title = source.title;
authorLastName = source.authorLastName;
authorFirstName = source.authorFirstName;
year = source.year;
}
void Book::setTitle(string ti)
{
title = ti;
}
void Book::setAuthor(string ln, string fn)
{
authorLastName = ln;
authorFirstName = fn;
}
bool Book::setYear(int yr)
{
bool result = false;
if (year >= 1500 && year <= 2009)
{ result = true;
year = yr;
}
else
result = false;
return result;
}
string Book::getTitle()
{
return title;
}
string Book::getAuthorLastName()
{
return authorLastName;
}
string Book::getAuthorFirstName()
{
return authorFirstName;
}
int Book::getYear()
{
return year;
}
bool Book::operator==(const Book & right)
{
if(title == right.title && authorLastName == right.authorLastName)
return true;
else
return false;
}#include <iostream>
using namespace std;
#include <string>
#include "Book.h"
void displayMenu();
void selectionSort(Book[], int);
int search(Book[], string, int);
int main()
{
const int SIZE = 100;
Book bookList[SIZE];
string locTitle;
string locLname;
string locFname;
int locYear = 0;
int choice = 1;
while (choice != 5)
{
displayMenu();
cin >> choice;
if (choice == 1)
{
int location = 0;
for (int x = 0 ; x < 1 ; x++)
{
cout << "Enter the Title: ";
cin >> locTitle;
cout << "Enter the author's last name: " ;
cin >> locLname;
cout << "Enter the author's first name: " ;
cin >> locFname;
cout << "Enter the year of publication for the book: " ;
cin >> locYear;
cout << "Enter the location of the book, which you would like to overwrite: ";
cin >> location;
bookList[location - 1].setTitle(locTitle);
bookList[location - 1].setAuthor(locLname, locFname);
bookList[location - 1].setYear(locYear);
}
}
if (choice == 2)
{
for (int r = 0; r < SIZE; r++)
{
cout << "Title: " << bookList[r].getTitle() << endl;
cout << "Author Last Name: " << bookList[r].getAuthorLastName() << endl;
cout << "Author First Name: " << bookList[r].getAuthorFirstName() << endl;
cout << "Year: " <<bookList[r].getYear() << endl;
cout << " ---------------------------------- " << endl;
cout << endl;
}
cout << " ---------------------------------- " << endl;
cout << " ---------------------------------- " << endl;
}
if (choice == 3)
{
selectionSort(bookList, SIZE);
}
if (choice == 4)
{
int results = 0;
string searchTarget;
cout<< "Enter the author to search for: ";
cin >> searchTarget;
results = search(bookList, searchTarget, SIZE);
if (results = -1)
{
cout << "Entry Not Found!" << endl;
}
else
{
cout << "Results" << endl;
cout << "Title: " << bookList[results + 1].getTitle() << endl;
cout << "Author Last Name: " << bookList[results + 1].getAuthorLastName() << endl;
cout << "Author First Name: " << bookList[results + 1].getAuthorFirstName() << endl;
cout << "Year: " <<bookList[results + 1].getYear() << endl;
cout << " ---------------------------------- " << endl;
cout << endl;
}
}
}
return 0;
}
void displayMenu()
{
cout << "Menu" << endl;
cout << "1. Add a book to the list. " << endl;
cout << "2. Print out the current list of books. " << endl;
cout << "3. Sort the list by the author's last name. " << endl;
cout << "4. Search for books by author. " << endl;
cout << "5. Exit the program. " << endl;
cout << "Enter your choice: ";
}
void selectionSort(Book list[], int SIZE)
{
int swp_index = 0; //tracks smallest found value
Book temp;
for (int a = 0; a < (SIZE - 1); a++)
{
swp_index = a;
for(int index = a + 1; index < SIZE; index++)
{
if (list[index].getAuthorLastName() < list[swp_index].getAuthorLastName() )
{
swp_index = index;
}
}
temp = list[a];
list[a] = list[swp_index];
list[swp_index] = temp;
}
}
int search(Book list[], string value, int size)// method to find index of specified element
{
int index = 0;
int position = -1;
bool found = false;
while(index < size && !found)
{
if (list[index].getAuthorLastName() == value)
{
found = true;
position = index;
}
index++;
}
return position;
}