C++中文件的读取与输出

ifstream infile;
    infile.open("F:\桌面\Code\text.txt", ios::in);   //文件的位置
    if (!infile.is_open())
    {
        cout << "文件打开失败" << endl;
        infile.close();
    }
    double x1;
infile >> x1;   //用来读取数据
 infile.close();  //读取完毕，释放文件

ofstream ofs;
    ofs.open("F:\桌面\Code\file1.txt", ios::out);
    if (!ofs.is_open())
    {
        ofs.close();
    }
    ofs << "ABCD" << "n";
    ofs << "abcd"<< "n";
    ofs.close();