Code doesn't show an array in a different switch case - c++

Question

(I'm just a guy trying to start programming so don't be too harsh, English is not my main language too)
I was trying to make a simple program about storing book into a library (with class since I started learning them) and the array won't show up in a different case other than the one in which I initialized it, the IDE doesn't show up any error too
Code:
#include <iostream>
using namespace std;
class MainMenu {
public:
int choice, ID, IDC;
string Name[500];
string Genre[500];
string Book[500];
void Menu() {
cout << "choose an action:" << endl;
cout << "1)\tadd a book\n2)\tsee my book" << endl;
cin >> choice;
switch (choice) {
case 1:
cout << "ID:" << endl;
cin >> ID;
cout << "name:" << endl;
cin >> Name[ID];
cout << "Genre" << endl;
cin >> Genre[ID];
cout << "> " << endl;
cin >> Book[ID];
cout << "<" << endl;
cout << "book successfully registered" << endl;
// assign a value about the book (name and genre) in each array stored
// with the id
break;
case 2:
cout << "ID?" << endl;
cin >> IDC; // IDC stands for ID Check, if ID == IDC then it should show
// the specs of the book + its content
cout << Name[IDC] << endl
<< Genre[IDC] << endl
<< "--> " << Book[IDC] << endl
<< endl;
break;
} // Switch
} // Menu
}; // Class
int main() {
int i = 0;
while (i == 0) // creating a loop to keep showing the menu without the end of
// the program
{
MainMenu giorgio;
giorgio.Menu(); // summoning menu
}
}

Answer 1

When you create a Object, all atributes are initialized, as a result, you create a emptiy arrays of your Object for each iteration, you can resolve this whit this code:
#include <iostream>
using namespace std;
class MainMenu {
public:
int choice, ID, IDC;
string Name[500];
string Genre[500];
string Book[500];
void Menu() {
cout << "choose an action:" << endl;
cout << "1)\tadd a book\n2)\tsee my book" << endl;
cin >> choice;
switch (choice) {
case 1:
cout << "ID:" << endl;
cin >> ID;
cout << "name:" << endl;
cin >> Name[ID];
cout << "Genre" << endl;
cin >> Genre[ID];
cout << "> " << endl;
cin >> Book[ID];
cout << "<" << endl;
cout << "book succesfully registered" << endl;
break;
case 2:
cout << "ID?" << endl;
cin >> IDC;
cout << Name[IDC] << endl
<< Genre[IDC] << endl
<< "--> " << Book[IDC] << endl
<< endl;
break;
}
}
};
int main() {
int i = 0;
MainMenu giorgio;
while (i == 0)
{
giorgio.Menu(); // summoning menu
}
}