#include <iostream>
#include <string>

using namespace std;

void menu();

int main(){
   int c;
   do {
   menu();
      cin >> c;

switch (c) {
case 1:
cout<<"Available videotapesn";
    break;
case 2:
cout<<"On loan videotapesn";
    break;
case 3:
cout<<"Cashn";
    break;
case 4:
cout<<"Exit";
    break;
default:
cout << "nInvalid choice.n";
    break;
}
            }while (c != 4);

return 0;
}

void menu() {
cout << endl;
cout << "1. Available videotapes" << endl;
cout << "2. On loan videotapes" << endl;
cout << "3. Cash" << endl;
cout << "4. Exit" << endl;
cout << endl;