// 写相应的东西到指定的目录中，并查询文件中的信息
void test03() {
ofstream writefile;
writefile.open("D:\\VS code\\book.txt"); // 这样的绝对路径可以识别
writefile << "C++程序设计" << " " << "xiaoxiao" << " " << "清华大学出版社" << " " << 36 << endl;
writefile << "Java程序设计" << " " << "xiaoliu" << " " << "xx大学出版社" << " " << 56 << endl;
writefile << "Python程序设计" << " "<< "xiaozhang" << " " << "jj大学出版社" << " " << 45 << endl;
writefile << "C#程序设计" << " " << "xiaowang" << " " << "vv大学出版社" << " " << 75 << endl;
writefile.close();
cout << "写入成功！" << endl;
ifstream readfile;
readfile.open("book.txt", ios::in);
if (!readfile.is_open()) {
cout << "Error opening file" << endl;
}
string s;
cout << "文件读取如下：" << endl;
while (!readfile.eof()) { //可以就按照这种方式读取文件
getline(readfile, s);
cout << s << endl;
}
readfile.close();
}
