📅 最后修改于: 2022-03-11 14:44:45.371000 🧑 作者: Mango
std::ifstream ifs("foo.txt"); // ifstream: Opens file "foo.txt" for reading only.
std::ofstream ofs("foo.txt"); // ofstream: Opens file "foo.txt" for writing only.
std::fstream iofs("foo.txt"); // fstream: Opens file "foo.txt" for reading and writing.