Нужно полностью прокомментировать каждую строчку решеннной задач на С++, помогите, плиз!!!!

[Fialaka_444]

#include <iostream.h>
#include <fstream.h>
#include <math.h>
#include <string.h>

class List
{
private:
struct Node
{
string key;
int code;
Node *next;
} * head;
public:
List();
~List();
void Add( int code, string value);
void LoadFromFile( string file_name);
void SaveToFile( string file_name);
void PrintToScreen();
void Sort();
void Clear();
bool operator = (List );
};


List::List()
{
head = NULL;
}


void List::Add( int code, string value)
{

Node *newNode = new Node;

newNode->key = value;
newNode->code = code;
newNode->next = head;
head = newNode;
}



void List::LoadFromFile( string file_name)
{
ifstream fin;
fin.open(file_name.data());

Clear();

string str;
int code;

while (1)
{
fin >> code >> str;
if (fin.eof())
break;
Add(code, str);
}

fin.close();
}


void List::SaveToFile( string file_name)
{
ofstream fout;
fout.open(file_name.data());

Node *t;
t = head;
while (t)
{
fout << t->code << " " << t->key << endl;
t = t->next;
}

fout.close();
}


void List::PrintToScreen()
{
Node * currentNode;
currentNode = head;
while (currentNode)
{
cout << "code: " << currentNode->code << "; string = " << currentNode->key << endl;
currentNode = currentNode->next;
}
}


bool List:perator = (List list)
{

Node *NodeList1 = head;
Node *NodeList2 = list.head;
while ((NodeList1) || (NodeList2))
{
if ((NodeList1->key != NodeList2->key) && (NodeList1->code != NodeList2->code))
return false;
NodeList1 = NodeList1->next;
NodeList2 = NodeList2->next;
}
return true;
}



void List::Sort()
{
Node *p, *q, *m;

p = head;

string st;
int ct;
while (p)
{
q = p; m = p;
while (q)
{
if (m->key.length() < q->key.length()) m = q;
q = q->next;
}
st = m->key;
m->key = p->key;
p->key = st;

ct = m->code;
m->code = p->code;
p->code = ct;

p = p->next;
}
}

void List::Clear()
{
Node *currentNode, *next;
currentNode = head;
while (currentNode)
{
next = currentNode->next;
delete currentNode;
currentNode = next;
}
head = NULL;
}

List::~List()
{
Clear();
}



int main()
{
List list1;
string s;
int n, code;
cout << "Input number of records: ";
cin >> n;
for (int i = 0; i < n; ++i)
{
cout << "Input code and string: ";
cin >> code >> s;
list1.Add(code, s);
}

list1.SaveToFile("List 1.txt");

list1.LoadFromFile("List 1.txt");

list1.Sort();

list1.SaveToFile("Sorted list 1.txt");
return 0;
}


/*
Файлы для хранения данных создаются в папке с программой
*/

[Vedrus]

См. приват.