fileio.cpp

绝对的ｐｒｉｍｅｒ的源代码 值得珍藏。第五版 外加清华讲义

// fileio.cpp -- saving to a file
#include <iostream> // not needed for many systems
#include <fstream>
#include <string>

int main()
{
    using namespace std;
    string filename;

    cout << "Enter name for new file: ";
    cin >> filename;

// create output stream object for new file and call it fout
    ofstream fout(filename.c_str());

    fout << "For your eyes only!\n";        // write to file
    cout << "Enter your secret number: ";   // write to screen
    float secret;
    cin >> secret;
    fout << "Your secret number is " << secret << endl;
    fout.close();           // close file

// create input stream object for new file and call it fin
    ifstream fin(filename.c_str());
    cout << "Here are the contents of " << filename << ":\n";
    char ch;
    while (fin.get(ch))     // read character from file and
        cout << ch;         // write it to screen
    cout << "Done\n";
    fin.close();

    return 0; 
}