can someone write detailed comments for this code

#include "stdafx.h"

#include

#include

#include "library.h"

#include

using namespace std;

bool checkIn(const int ID, Book inventory[], const int numBooks)

{

int ind = findBook(ID, inventory, numBooks);

if (ind == -1)

return false;

inventory[ind].checkedOut = true;

return true;

}

void checkIn(Book inventory[], const int numBooks)

{

int ID;

cout << "Enter book ID u want to check in" << endl;

cin >> ID;

checkIn(ID, inventory, numBooks);

}

bool checkOut(const int ID, Book inventory[], const int numBooks)

{

int ind = findBook(ID, inventory, numBooks);

if (ind == -1)

return false;

inventory[ind].checkedOut = false;

return true;

}

void checkOut(Book inventory[], const int numBooks)

{

int ID;

cout << "Enter book ID u want to check out" << endl;

cin >> ID;

checkOut(ID, inventory, numBooks);

}

//Sorting

void sort(Book inventory[], int numBooks)

{

for (int i = 0; i

{

for (int j = 0; j < numBooks-1; j++)

{

if (inventory[j].ID > inventory[j + 1].ID)

{

string tauthor, ttitle;

int tid;

bool tcb;

tauthor = inventory[j].author;

ttitle = inventory[j].title;

tid = inventory[j].ID;

tcb = inventory[j].checkedOut;

inventory[j].author = inventory[j + 1].author;

inventory[j].title = inventory[j + 1].title;

inventory[j].ID = inventory[j + 1].ID;

inventory[j].checkedOut = inventory[j + 1].checkedOut;

inventory[j + 1].author= tauthor;

inventory[j+1].title= ttitle;

inventory[j + 1].ID= tid;

inventory[j + 1].checkedOut= tcb ;

}

}

}

}

bool addBook(const std::string & author, const std::string & title, const int ID, Book inventory[], int & numBooks)

{

inventory[numBooks].author = author;

inventory[numBooks].title = title;

inventory[numBooks].ID = ID;

inventory[numBooks].checkedOut = false;

numBooks++;

return true;

}

void addNewBook(int & currID, Book inventory[], int & numBooks)

{

string author;

string title;

string dummy;

getline(cin,dummy);

cout << "Enter author name" << endl;

getline(cin, author);

cout << "Enter title " << endl;

getline(cin, title);

cout << "Enter Bookd ID " << endl;

cin >> currID;

addBook(author, title, currID, inventory, numBooks);

sort(inventory, numBooks);

}

void removeBook(Book inventory[], int & numBooks)

{

int ID;

cout << "Enter book ID u want to find" << endl;

cin >> ID;

removeBook(ID, inventory, numBooks);

}

bool removeBook(const int ID, Book inventory[], int & numBooks)

{

int ind = findBook(ID, inventory, numBooks);

if (ind == -1)

return false;

for (int i = ind ; i < numBooks+1; i++)

inventory[i] = inventory[i + 1];

numBooks--;

return true;

}

bool loadBooks(const std::string & fileName, Book inventory[], int & numBooks, int & lastID)

{

std::ifstream file(fileName);

std::string line;

std::getline(file, line);

//cout << fileName << endl;

while (std::getline(file, line))

{

//cout << line << endl;

stringstream s(line);

string author;

string title;

int ID;

string stat;

bool cf;

s >> author;

s >> title;

s >> ID;

s >> stat;

if (stat == "t")

cf = true;

else

cf = false;

int ind = findBook(ID, inventory, numBooks);

if (ind != -1)

continue;

inventory[numBooks].author = author;

inventory[numBooks].title = title;

inventory[numBooks].ID = ID;

inventory[numBooks].checkedOut = cf;

numBooks++;

}

file.close();

cout << numBooks << endl;

return true;

}

bool saveBooks(const std::string & fileName, const Book inventory[], const int numBooks, const int lastID)

{

ofstream myfile(fileName);

myfile << numBooks << " ";

for (int i = 0; i < numBooks; i++)

{

myfile << inventory[i].author << "\t" << inventory[i].title << "\t" << inventory[i].ID << "\t";

if (inventory[i].checkedOut)

myfile << "t ";

else

myfile << "f ";

}

myfile.close();

return true;

}

int findBook(const int ID, const Book inventory[], const int numBooks)

{

//Binary Search

int i = 0, j = numBooks;

while (i <= j)

{

int mid = (i + j) / 2;

if (inventory[mid].ID == ID)

return mid;

if (inventory[mid].ID > ID)

j = mid - 1;

else

i = mid + 1;

}

/*for (int i = 0; i < numBooks; i++)

{

if (inventory[i].ID == ID)

return i;

}*/

return -1;

}