Infinite loop in switch statement?

Whenever I choose option 3 it just does an infinite loop or some matrix looking thing. LOL. Can anyone tell me why? I don't think it's in the function but I'm not sure. Thanks in advance!

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#include <iostream>
#include <fstream>
#include <iomanip>
#include <cctype>       //  for toupper function
using namespace std;

struct Country {
	char name[16]; 	// country name
	long pop;       // population
	double gdp; 	// gross domestic product
};

const char * file = "countries.dat";

// read and display contents of countries.txt;
//  return number of records in file
int prntCtries(fstream & fil);
// update countries.txt; size is number of records
void updtCtries(fstream & fil, int size);
// add data to countries.txt
void addCtries(fstream & fil);
int menu(); // pulls up menu



int main()
{
    fstream fin;            // input file object
    fstream fout;           // output file object
    int cnt = 0;            // number of records in file
    fout.open(file, ios::out | ios::binary);
    fout.close();
	int choice;
  
	do{
		choice = menu(); //choice for menu
		
		switch(choice)
		{
		case 1:
			cnt = prntCtries(fin);
			break;
		case 2:
			cout << "This is the function I don't have! LOL " << endl;
			break;
		case 3:
			addCtries(fin);
			break;
		case 4:
			 updtCtries(fin, cnt);   // update file contents
			 break;
		case 5:
			cout << "Quitting program..."  << endl << endl;
			break;
		default:
			cout << "This is not a valid menu option!" << endl;
			break;
		}
	}while(choice != 5);
		
    if (cnt == -1)          // problem encountered
        exit(2);
   
    cout << endl;
    cnt = prntCtries(fin);  // show file contents
    if (cnt == -1)          // problem encountered
        exit(2);
    fin.close();            // close file
    return 0;
}//endmain

int prntCtries(fstream & fil) // end openFiles()
{
    Country c;
    int ndx = 0;
    cout << fixed << showpoint << setprecision(1);
    fil.open(file, ios::in | ios::binary);
    if (fil.is_open()) {
        fil.seekg(0);       // position at beginning of file
        cout << "Current contents of \"" << file << "\" file:\n";
        cout << "     Country \t       Population (M)      GDP ($M)\n";
        while (fil.read(reinterpret_cast<char *>(&c), sizeof(c))) {
            cout << ++ndx << ". " << setw(15) << c.name << setw(16)  << c.pop << setw(16)  << c.gdp << endl;
        } // endwhile
        if (fil.eof())
            fil.clear();    // clear EOF flag
        else {              // possible error condition
            cout << " *** Error reading " << file << endl;
            return -1;         
        } // endif 
    } // endif-thenPart
    else {
        cout << " *** Open \"" << file << "\" for input failed ***\n";
        return -1;
    } // endif-elsePart
    fil.close();            // close file
    return ndx;
} // end prntCtries()

void updtCtries(fstream & fil, int size)  
{
    Country c;
    int ndx = 0;        // record number to change
    streampos pos;      // location of record to update
    
    cout << fixed << showpoint << setprecision(1);  // output formatting
    fil.open(file, ios::out | ios::in | ios::binary);
    cout << " Enter the record # to change: ";
    cin >> ndx;
    cin.get();          // get and ignore endline
    --ndx;              // we start indexes at zero
    if (ndx < 0 || ndx >= size) {
        cout << " *** Invalid record # - Adios!\n";
        exit(3);
    } // endif
    pos = ndx * sizeof(Country);
    fil.seekg(pos);
    if (fil.fail()) {
        cout << " *** seek failed ***\n";
        return;
    } // endif
    fil.read(reinterpret_cast<char *>(&c), sizeof(c));
    cout << "Country selected:\n";
    cout << ndx+1 << ". " << setw(15) << c.name << setw(16)  << c.pop << setw(16)  << c.gdp << endl;
    if (fil.eof())
        fil.clear();        // clear EOF flag
    cout << "Enter country name: ";
    cin.get(c.name, 16);
    //cout << " Country: " << c.name << endl;
    cin.get();          // get and ignore endline
    cout << " Enter population of " << c.name << ": ";
    cin >> c.pop;
    //cout << "  Population: " << c.pop << endl;
    cout << " Enter GDP of " << c.name << "(in USD): $";
    cin >> c.gdp;
    fil.seekg(pos);     // set pointer to start of record
    fil.write(reinterpret_cast<char *>(&c), sizeof(c));
    if (fil.fail()) {
        cout << " *** attempted write failed ***\n";
        return;
    } // endif
    fil << flush;       // force disk write
    fil.close();        // close file
    int k = prntCtries(fil);    // print updated file
} // end updtCtries()

void addCtries(fstream & fil) // end openFiles()
{
    Country c;
    cout << fixed << showpoint << setprecision(1);
    fil.open(file, ios::out | ios::app | ios::binary);
    if (fil.is_open()) {
        cout << "\n ... adding to \"" << file << "\" ...\n";
        cout << "Enter country name (or or 'X' to quit): ";
        cin.get(c.name, 16);
        while (toupper(c.name[0]) != 'X') {
            cout << " Country: " << c.name << endl;
            cin.get();      // get and ignore endline
            cout << " Enter population of " << c.name << ": ";
            cin >> c.pop;
			cout << "  Population: " << c.pop << endl;
            cout << " Enter GDP of " << c.name << "(in USD): $";
            cin >> c.gdp;
            fil.write(reinterpret_cast<char *>(&c), sizeof(c));
            cin.get();      // get and ignore endline
            cout << "\nEnter country name (or 'X' to quit) : ";
            cin.get(c.name, 20);
        } // endwhile
    } // endif-thenPart
    else {
        cout << " *** Open \"" << file << "\" for input failed ***\n";
        return;
    } // endif-elsePart
    fil.close();            // close file
} // end addCtries()

int menu()
{
    int sel = 5;    // menu selection
    cout << "\n * * *   M A I N   M E N U   * * *\n\n";
    cout << "1. Print All Records " << endl;
	cout << "2. Print One Specific Countries Info" << endl;
	cout << "3. Add a Record" << endl;
	cout << "4. Update a Record " << endl;
	cout << "5. Quit " << endl;
    cout << "\tEnter your choice (1..5): ";
    cin >> sel;
    while (sel < 1 || sel > 5) {
        cout << "\tPlease enter 1 to 5: ";
        cin >> sel;
    } // endwhile
    return sel;
}
        
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