12)Задача 1

#include<iostream>
#include<cstring>
using namespace std;

class Book {
    protected:
    char ISBN[20];
    char naslov[50];
    char avtor[30];
    int cena;

    public:
    Book (char * i, char * n, char * a, int c) {
        strcpy(ISBN,i); strcpy(naslov,n); strcpy(avtor,a); cena=c;
    }

    virtual double bookPrice () = 0;

    virtual ~Book () {}

    friend ostream &operator << (ostream &out, Book &b) {
        out<<b.ISBN<<": "<<b.naslov<<", "<<b.avtor<<" "<<b.bookPrice()<<endl;
        return out;
    }

    bool operator > (const Book &b){
        return cena > b.cena;
    }

    void setISBN (const char * i) {strcpy(ISBN,i); }
};

class OnlineBook : public Book {
    private:
    char * url;
    int golemina;

    public:
    OnlineBook (char * i, char * n, char * a, int c, char *u, int g) : Book(i,n,a,c) {
        url = new char [strlen(u)+1];
        strcpy(url,u); golemina=g;
    }

   // ~OnlineBook () {delete [] url; }

    double bookPrice () {
        if (golemina>20)
            return 1.2*cena;
        else return cena;
    }
};

class PrintBook : public Book {
    private:
    double masa;
    bool zaliha;

    public:
    PrintBook (char * i, char * n, char * a, int c, double m, bool z) : Book (i,n,a,c) {
        masa=m; zaliha=z;
    }

    double bookPrice () {
        if (masa>0.7)
            return 1.15*cena;
        else
            return cena;
    }
};

void mostExpensiveBook (Book ** books, int n) { //broj na online, broj na pecateni, najskapa kniga
    int online=0, pecateni=0;
    int maxcena=0,maxi;



    for (int i=0;i<n;i++) {
       Book * tmp = dynamic_cast < OnlineBook *>(books[i]);
        if (tmp)
            ++online;
        else ++pecateni;

        if (books[i]->bookPrice() > maxcena){
            maxi=i;
            maxcena=books[i]->bookPrice();
        }
    }
    cout<<"FINKI-Education"<<endl;
    cout<<"Total number of online books: "<<online<<endl;
    cout<<"Total number of print books: "<<pecateni<<endl;
    cout<<"The most expensive book is: "<<endl;
    cout<<*books[maxi];

}

int main(){

    char isbn[20], title[50], author[30], url[100];
    int size, tip;
    float price, weight;
    bool inStock;
    Book  **books;
    int n;

    int testCase;
    cin >> testCase;

    if (testCase == 1){
        cout << "====== Testing OnlineBook class ======" << endl;
        cin >> n;
        books = new Book *[n];

        for (int i = 0; i < n; i++){
            cin >> isbn;
            cin.get();
            cin.getline(title, 50);
            cin.getline(author, 30);
            cin >> price;
            cin >> url;
            cin >> size;
            cout << "CONSTRUCTOR" << endl;
            books[i] = new OnlineBook(isbn, title, author, price, url, size);
            cout << "OPERATOR <<" << endl;
            cout << *books[i];
        }
        cout << "OPERATOR >" << endl;
        cout << "Rezultat od sporedbata e: " << endl;
        if (*books[0] > *books[1])
            cout << *books[0];
        else
            cout << *books[1];
    }
    if (testCase == 2){
        cout << "====== Testing OnlineBook CONSTRUCTORS ======" << endl;
        cin >> isbn;
        cin.get();
        cin.getline(title, 50);
        cin.getline(author, 30);
        cin >> price;
        cin >> url;
        cin >> size;
        cout << "CONSTRUCTOR" << endl;
        OnlineBook ob1(isbn, title, author, price, url, size);
        cout << ob1 << endl;
        cout << "COPY CONSTRUCTOR" << endl;
        OnlineBook ob2(ob1);
        cin >> isbn;
        ob2.setISBN(isbn);
        cout << ob1 << endl;
        cout << ob2 << endl;
        cout << "OPERATOR =" << endl;
        ob1 = ob2;
        cin >> isbn;
        ob2.setISBN(isbn);
        cout << ob1 << endl;
        cout << ob2 << endl;
    }
    if (testCase == 3){
        cout << "====== Testing PrintBook class ======" << endl;
        cin >> n;
        books = new Book *[n];

        for (int i = 0; i < n; i++){
            cin >> isbn;
            cin.get();
            cin.getline(title, 50);
            cin.getline(author, 30);
            cin >> price;
            cin >> weight;
            cin >> inStock;
            cout << "CONSTRUCTOR" << endl;
            books[i] = new PrintBook(isbn, title, author, price, weight, inStock);
            cout << "OPERATOR <<" << endl;
            cout << *books[i];
        }
        cout << "OPERATOR >" << endl;
        cout << "Rezultat od sporedbata e: " << endl;
        if (*books[0] > *books[1])
            cout << *books[0];
        else
            cout << *books[1];
    }
    if (testCase == 4){
        cout << "====== Testing method mostExpensiveBook() ======" << endl;
        cin >> n;
        books = new Book *[n];

        for (int i = 0; i<n; i++){

            cin >> tip >> isbn;
            cin.get();
            cin.getline(title, 50);
            cin.getline(author, 30);
            cin >> price;
            if (tip == 1) {

                cin >> url;
                cin >> size;

                books[i] = new OnlineBook(isbn, title, author, price, url, size);

            }
            else {
                cin >> weight;
                cin >> inStock;

                books[i] = new PrintBook(isbn, title, author, price, weight, inStock);
            }
        }

        mostExpensiveBook(books, n);
    }

    for (int i = 0; i<n; i++) delete books[i];
        delete[] books;
    return 0;
}