C++文件输入和创建

    #include <fstream>
        //头文件
    

    ifstream inf;
    ofstream ouf;
    inf.open("zy4.txt", ios::out);
    if (!inf)
    {
        inf.close();
        ouf.open("zy4.txt");
        if (ouf)
            cout << "zy4.txt Created successfully!" << endl;
    }
    else
        cout << "The file is exited !
";    
    
 　　//创建文件


    ofstream fout1("zy4.txt");
    if (!fout1.is_open())
    {
        cerr << "无法打开文件 " << "zy4.txt" << endl;
        exit(0);
    }
    fout1 << S << endl;
    fout1.close();
 　　//写入文件