Having issues making the (.txt file fstream) be shown on the console as a switch option

Question

I am making a program for an assignment. The purpose is to do a basic fstream (ifstream and ofstream) registry of books like for example:

1. Reading the list of books
2. Add a book on the list
3. Erase all the list
4. Close program (Just translating the spanish stuff I have written there)

---

Anyhow, There's a code here that I have made that is giving me a bit of trouble making it to work. The code below: (I want to show the "No books" text in the console while it is in the .txt file)

Also, it is giving me this error:

Error E0546 transfer of control bypasses initialization of line 56: variable "myfile" (declared at line 59) variable "line" (declared at line 60)

---

 #include <iostream>
   #include <string>
    #include <fstream>
    #include <sstream>
   using namespace std;
   string Num = "1234";
   ofstream myfiler("LibrosBooksSampl.txt");
   int main()
   {

    string opcion;
    char character;


    cout << "Que quieres hacer: \n";
    cout << "opcion 1: Ver libros guardados.\n";
    cout << "opcion 2: Incluir libros nuevos.\n";
    cout << "opcion 3: Borrar todo el file.\n";
    cout << "opcion 4: Salir del programa.\n";
    cout << "Opcion: ";
    getline(cin, opcion);
    stringstream(opcion) >> character;

    while (opcion.find_first_not_of(Num) != string::npos)
    {
        cout << "Solo del 1 al 4 mano: "; getline(cin, opcion);
    }


    switch (character)
    {
    case '1': 
     ifstream myfile("LibrosBooksSample.txt");
    string line = "no books";
    if (myfile.is_open())
    {
        while (myfile >> line)
        {
            cout << line << endl;
        }
        myfile.close();
    }
    else
    {
        cout << "Unable to open file";
    }break;

    case '2': cout << "yes";
    }


cout << "\n\n";
system("pause");
     }