C でユーザーからのテキスト行全体を読み取る方法

string response;
getline(cin, response);

char x;

cout << "Would you like to write to a file?" << endl;
cin >> x;
if (x == 'y' || x == 'Y')
{
    string response;
    cout << "What would you like to write." << endl;
    getline(cin, response);
    ofstream file;
    file.open("Characters.txt");
    file << strlen(response.c_str()) << " Characters." << endl;
    file << endl;
    file << response; // Now writes the entire line

    file.close();

    cout << "Done. \a" << endl;
}
else
{
    cout << "K, Bye." << endl;
}