string Title;

string Author;

float* Rates;

int RatesCounter;

Book(string title, string author) {

Title = title;

Author = author;

RatesCounter = 2;

Rates = new float[RatesCounter];

Rates[0] = 5;

Rates[1] = 4;

}

~Book() { // involking when the app finishing.

delete[] Rates;

Rates = nullptr;

}

// deep copy constructor

Book(const Book& original) { // 1. using const to prevent the original be modified.

// 2. using reference "&"

Title = original.Title;

Author = original.Author;

RatesCounter = original.RatesCounter;

Rates = new float[RatesCounter]; // 3. make a new object.

for(int i = 0; i < RatesCounter; i++) { // 4. copy the origin data to the new obj

Rates[i] = original.Rates[i];

}

}

Book book1("Show me", "the monry"); // it'll call Book(string title, string author)

Book book2("show must", "go on"); // it'll call Book(string title, string author)

// Book book3 = book1; // involking copy constructor - Book(const Book& original)

Book book3(book1); // involking copy constructor - same as the upper

for(auto i = 0; i < book3.RatesCounter; i++)

cout << book3.Rates[i] << endl;

return 0;

}