Two Small Problems With Simple File I/O

// user defined filehandle
#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main()
{
    string user_filename, user_input;
    unsigned int line_count;
    cout << "Filename to open for writing: ";
    getline(cin, user_filename);
    ofstream user_filehandle (user_filename.c_str());
    cout << "Begin typing the data you want stored into " << user_filename
         << endl << "Type EOF on a single line when finished" << endl;
    while(1) {
                     if(user_input == "EOF") break;
                     line_count++;
                     getline(cin, user_input);
                     user_filehandle << user_input << endl;
                     fflush(stdin);
    }
    user_filehandle.close();
    cout << "Wrote " << line_count << " lines to " << user_filename << endl;
    cin.get();
    return 0;
}