sort array of objects alphabetically c++ - c++

Question

I am enrolled in an Object Oriented programming class and am using code::blocks as my IDE. We have a project that requires to pass an array of objects ( a Libray book array with private names and titles) into a sort array that will sort the titles or authors alphabetically. I have all the components working as they should be except the sort function. I used a sort function that I have used before in other programs but am having trouble getting it to work with this program. I am still in the beginning stages of learning how to code and would appreciate any feedback.
Header file:
#include <iostream>
#include <cstring>
using namespace std;
class Book
{
private:
string title;
string author;
public:
Book();
string getTitle();
string getAuthor();
void setTitle(string Title1);
void setAuthor(string Author1);
};
Main:
#include <iostream>
#include <cstring>
#include <iomanip>
#include "Library.h"
using namespace std;
//Sort function prototype
void s_sort (Book lib_books[], int n);
int main()
{
// Initializes n as the number of books
int n = 15;
//Declaration of array of objects
Book lib_books[15];
// Declartion of the private member "title" for each object
lib_books[0].setTitle("The Alchemist");
lib_books[1].setTitle("The Princess Bride");
lib_books[2].setTitle("The Catcher in the Rye");
lib_books[3].setTitle("1984");
lib_books[4].setTitle("Fahrenheit 451");
lib_books[5].setTitle("The Great Gatsby");
lib_books[6].setTitle("Poland");
lib_books[7].setTitle("The Cantebury Tales");
lib_books[8].setTitle("Leaves of Grass");
lib_books[9].setTitle("Where the Sidewalk Ends");
lib_books[10].setTitle("The Iliad");
lib_books[11].setTitle("Things to Think On");
lib_books[12].setTitle("The Grapes of Wraith");
lib_books[13].setTitle("Hop on Pop");
lib_books[14].setTitle("The Prince and the Pauper");
// Declartion of the private member "author" for each object
lib_books[0].setAuthor ("Paulo Coalho");
lib_books[1].setAuthor ("William Goldman");
lib_books[2].setAuthor ("J.D. Salinger");
lib_books[3].setAuthor ("George Orwell");
lib_books[4].setAuthor ("Ray Bradbury");
lib_books[5].setAuthor ("F. Scott Fitzgerald");
lib_books[6].setAuthor ("James A. Mitchener");
lib_books[7].setAuthor ("Chaucer");
lib_books[8].setAuthor ("Walt Whitman");
lib_books[9].setAuthor ("Shel Silverstein");
lib_books[10].setAuthor("Homer");
lib_books[11].setAuthor("Krishnamurti");
lib_books[12].setAuthor("John Steinbeck");
lib_books[13].setAuthor("Dr. Seuss");
lib_books[14].setAuthor("Mark Twain");
The portion of main that I'm having issues:
// Function to sort the books alphabetically by author
s_sort (lib_books,n);
cout << "\n";
// For loop to print all 15 books with author and title
for(int i = 0; i < 14; i++)
{
cout <<" "<<setw(25)<<lib_books[i].getTitle()<< " " <<lib_books[i].getTitle()<< "\n" ;
}
return 0;
}
//Sort function definition
void s_sort (Book::getTitle(), int n)
{
int m;
string hold;// Initializes 'hold' as a 'string' so all the characters will be used when it is sorted
for (int k=0; k<=n-1; k++)// 'For' loop sorts through the index
{
m = k;
for (int j=k+1; j <= n-1; j++)
{
if (lib_books[j].getTitle() < lib_books[m].getTitle());
//m = j;
}
// Swaps the lib_book[].getTitle() around and uses 'hold' as a placement
hold = lib_books[m].getTitle();
lib_books[m].getTitle() = lib_books[k].getTitle();
lib_books[k].getTitle() = hold;
hold = lib_books[m].getAuthor();
lib_books[m].getAuthor() = lib_books[k].getAuthor();
lib_books[k].getAuthor() = hold;
}
}
Implementation file:
#include <iostream>
#include <cstring>
#include "Library.h"
using namespace std;
Book::Book()
{
title = " ";
author = " ";
}
string Book::getTitle()
{
return title;
}
string Book::getAuthor()
{
return author;
}
void Book::setTitle(string Title1)
{
title= Title1;
}
void Book::setAuthor(string Author1)
{
author= Author1;
}
The problem that I am having is that it doesn't sort the array. It prints out the same list that was defined. I have tried to pass the array by reference but it needs a index number in the function prototype and definition.