Написать класс Автомобиль

#include "stdafx.h"
#include <iostream>
#include <string>
 
using namespace std;
 
struct DATE
{
    int number;
    int month;
    int year;
};
typedef struct informations
{
    char code[10];//код владельца
    char number_car[10];//номер автомобиля
    char mark[10];//марка автомобиля
    DATE release;//дата выпуска
    DATE registration;//дата регистрации
    struct informations* next; 
 
} Informations;
 
Informations* top = NULL;
 
void push() //ввод
{ 
    Informations* ptr = (Informations *)malloc(sizeof(Informations)); 
    
        cin.get();
        cout<< "Enter the code owner:\t\t";
        cin.getline(ptr->code,9);
        cout<< "Enter the number of the car:\t";
        cin.getline(ptr->number_car,9);
        cout<< "Enter the mark of the car:\t";
        cin.getline(ptr->mark,9);
        
            cout<< "\nEnter the date of release:\n";
            do{
                cout<<"number:\t\t\t\t";
                cin>>ptr->release.number;
              } while((ptr->release.number>31 ) || (ptr->release.number <= 0));
            do{
                cout<<"month:\t\t\t\t";
                cin>>ptr->release.month;
              } while((ptr->release.month>12 ) || (ptr->release.month <= 0));
            do{
                cout<<"year:\t\t\t\t";
                cin>>ptr->release.year;
              } while(ptr->release.year < 0);
 
            cout<< "\nEnter the date of registration:\n";
            do{
                cout<<"number:\t\t\t\t";
                cin>>ptr->registration.number;
              } while((ptr->registration.number>31 ) || (ptr->registration.number <= 0));
            do{
                cout<<"month:\t\t\t\t";
                cin>>ptr->registration.month;
              } while((ptr->registration.month>12 ) || (ptr->registration.month <= 0));
            do{
                cout<<"year:\t\t\t\t";
                cin>>ptr->registration.year;
              } while(ptr->registration.year < 0);
            cout <<'\n';
    
    ptr->next = top; 
    top = ptr; 
}
void pop() //удаление
{
    while (top != NULL)
    //for ( int i=0;   ; i++)
    { 
        Informations* ptr = top->next;
        //if (i==p)
        //{
            cout<<top->code<<"  "; 
            cout<<top->number_car<<"  ";  
            cout<<top->mark<<" - deleted\n"; 
            free(top); 
            top = ptr;
            //ptr = top->next;
            //break;
        //}
    } 
}
void show_stack() //просмотр элем стека
{ 
    int i=0;
    cout<<'\n';
    Informations* ptr = top; 
    while(ptr != NULL) 
    { 
        i++;
        cout<<"           "<<i<<endl;
        cout<<"The code owner:\t\t\t"<<ptr->code<<endl;
        cout<<"The number of the car:\t\t"<<ptr->number_car<<endl;
        cout<<"The mark of the car:\t\t"<<ptr->mark<<"\n\n";
        cout<<"The date of release:\nnumber:\t\t\t\t"<<ptr->release.number
            <<"\nonth:\t\t\t\t"<<ptr->release.month
            <<"\nyear:\t\t\t\t"<<ptr->release.year<<"\n\n";
        cout<<"The date of registration:\nnumber:\t\t\t\t"<<ptr->registration.number
            <<"\nmonth:\t\t\t\t"<<ptr->registration.month
            <<"\nyear:\t\t\t\t"<<ptr->registration.year<<"\n\n";
        ptr = ptr->next; 
    } 
}
void change()//изменение
{
    //Informations* ptr = top->next;
    cin.get();
        cout<< "Enter the code owner:\t\t";
        cin.getline(top->code,9);
        cout<< "Enter the number of the car:\t";
        cin.getline(top->number_car,9);
        cout<< "Enter the mark of the car:\t";
        cin.getline(top->mark,9);
        
            cout<< "\nEnter the date of release:\n";
            do{
                cout<<"number:\t\t\t\t";
                cin>>top->release.number;
              } while((top->release.number>31 ) || (top->release.number <= 0));
            do{
                cout<<"month:\t\t\t\t";
                cin>>top->release.month;
              } while((top->release.month>12 ) || (top->release.month <= 0));
            do{
                cout<<"year:\t\t\t\t";
                cin>>top->release.year;
              } while(top->release.year < 0);
 
            cout<< "\nEnter the date of registration:\n";
            do{
                cout<<"number:\t\t\t\t";
                cin>>top->registration.number;
              } while((top->registration.number>31 ) || (top->registration.number <= 0));
            do{
                cout<<"month:\t\t\t\t";
                cin>>top->registration.month;
              } while((top->registration.month>12 ) || (top->registration.month <= 0));
            do{
                cout<<"year:\t\t\t\t";
                cin>>top->registration.year;
              } while(top->registration.year < 0);
            cout <<'\n';
}
void November_and_December()
{
    Informations* ptr = top; 
    while (ptr != NULL)
    { 
        if (( ptr->registration.month == 11) || ( ptr->registration.month == 12) );
        cout<<"The number of the car:\t\t"<<ptr->number_car<<endl;
        cout<<"The mark of the car:\t\t"<<ptr->mark<<"\n\n";
        ptr = ptr->next; 
    } 
}
void Average_age()
{
    ;
}
void main()
{
    int l;
    do
    { 
        cout<<"--------------------------------------\n";
        cout<<"\n 1)!Enter \n 2)!Show \n 3)Search \n 4)!Delete \n "
            <<"5)!Change \n 6)!November and December \n 7)Average age"
            <<" \n 8)Exit \n ";
        cin >> l;
        switch(l)
        {
            case 1:push(); break;
            case 2:show_stack(); break;
            case 4:
                {
                    //int p;
                    //cin>>p;
                    if (top != NULL) pop();break;
                }
            case 5:
                {
                    //int p;
                    //cin>>p;
                    if (top != NULL) change();break;
                }
            case 6:
                {
                    if (top != NULL) November_and_December();break;
                }
            case 7: if (top != NULL) Average_age();break;
 
            default:break;
        }
    } 
    while(l!=8);
}