Newbie simple program issue

int main(void) 
{
    int choice = 0;
	do//Menu loop//
	{
    
    cout << "xxxxxxxxxxx...........\n";
    cout << "xxxxxxxxxxx(enter corresponding number):";
    cout << "\n"; 
    
    cout << "1. xxxx\n";
    cout << "2. xxxx\n";
    cout << "3. xxxx\n";
    cout << "\n"; 
   
int choice ;
    
	cout << "Enter choice:";
	cin >> choice;
 
    }
	while (choice < 0 ||choice > 4);//loop conditions//
	{
   
switch (choice)
{
    case 1:
           cout << "Opening port, press power shortly" << endl;
    break;

    case 2: 
           cout << "Opening port, press power shortly" << endl;
    break;

    case 3: 
           cout << "Opening port, press power shortly" << endl;
    break;  
    
    default:
           cout<<"Invalid option!" <<endl;
    break;     
    }  
    
    return 0; }