#include <iostream>  //有些系统里面可以省略此头文件

#include <fstream>

#include <string>

int main()

{

    using namespace std;

    string filename;

    cout << "please enter name for new file" << endl;

    cin >> filename;

    ofstream  fout( filename.c_str());

    fout << "For your eyes only! \n";

    cout << "Enter your secret number: ";

    string secret;

    cin >> secret;

    fout <<"Your secret number is " <<secret << endl;

    fout.close();

    ifstream fin(filename.c_str());

    cout << "Here are the contents of " << filename << ":\n";

    char ch;

    while (fin.get(ch))

    {

        cout << ch;

    }

    cout << "Done!\n";

    fin.close();

    return ;

}