Структуры. Вызов данных структуры по указателю. с++

#include <conio.h>
#include <iostream>
 
using namespace std; 
struct Article
{
    int Article_number;
    int Quantity;
    char Decription[20] ;
};
 
void Print (struct Article *art )
{
cout << "article number: " << art -> Article_number;
cout << endl;
cout << "article number: " << art -> Quantity ;
cout << endl;
cout << "article number: " << art -> Decription[20] ;
cout << endl;
}
 
int main (int argc, char *argv[])
{
    struct Article art; 
 
    art.Article_number = 554; 
    art.Decription[20] = ('H','i');
    art.Quantity = 11;
 
    Print(&art);
    cout << endl;
    system ("pause") ;
 
}

#include <iostream>
#include <cstring>
 
typedef struct 
{
    int Article_number;
    int Quantity;
    char Decription[20];
    void print()
    {
        std::cout << "article number: " << Article_number << std::endl;
        std::cout << "article quantity: " << Quantity << std::endl;
        std::cout << "article decription: " << Decription << std::endl;
    }
} Article;
 
int main (int argc, char *argv[])
{
        Article* art = new Article; 
        art -> Article_number = 554; 
        strcpy(art -> Decription, "hi\0");
        art -> Quantity = 11;
        art -> print();
        std::cout << std::endl;
        delete art;
        return 0;
}

char str[20];
//
str = "hi";

#include <iostream>
 
using namespace std;
 
class reading {
private:
    int num;
    int count;
    char note[20];
public:
    reading (int val, int cnt, char s[20]) { num = val; count = cnt; strcpy (note, s); }
    friend ostream& operator<< (ostream& s, reading& d);  
};
 
ostream& operator<< (ostream& s, reading& d) {
        s << "article number: " << d.num << endl;
        s << "article quantity: " << d.count << endl;
        s << "article decription: " << d.note << endl;
        return s;
}
 
int main ()
{
    reading obj(10, 20, "ABC");
 
    cout << obj << endl;
 
    system ("pause");
    return 0;
}