클래스 Book 얕은 복사 생성자

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

class Book {
private:
    double price;
    int pages;
    char* title;
    char* author;
public:
    Book(double price, int pages, const char* title, const char* author);
    ~Book();
    void changeTitle(const char* title);
    void show();
};

Book::Book(double price, int pages, const char* title, const char* author)
{
    this->price = price;
    this->pages = pages;

    int len_t = strlen(title);
    this->title = new char[len_t + 1];
    strcpy(this->title, title);

    int len_a = strlen(author);
    this->author = new char[len_a + 1];
    strcpy(this->author, author);
}

Book::~Book()
{
    if (title)
        delete[] title;
    if (author)
        delete[] author;
}

void Book::changeTitle(const char* title)
{
    if (strlen(title) > strlen(this->title))
        return;
    strcpy(this->title, title);
}

void Book::show()
{
    cout << "가격 : " << price << endl;
    cout << "페이지 수 : " << pages << endl;
    cout << "제목 : " << title << endl;
    cout << "저자 : " << author << endl << endl;
}


int main()
{
    cout << "2018305065 전유정" << endl;

    Book b1(15000.0, 500, "명품 C++ programming", "황기태");
    Book b2(b1);
    b1.show();
    b2.show();

    b2.changeTitle("C언어");
    cout << "=========== 제목 변경 ==========" << endl;
    b1.show();
    b2.show();
}