#include <fstream>

1 fstream

2 Ifstream

3 Ofstream

1 fstream

Open the input and output file stream

1#include <iostream>2#include <fstream>3 4 voidMain ()5 {6Std::fstream Fio ("F:\\1.txt", Std::ios::inch| Std::ios:: out);7     8Fio <<"Hello"<< Std::endl;//Write9Fio <<" World"<<Std::endl;TenFio <<"Hello"<<Std::endl; OneFio <<" China"<<Std::endl; A  -Fio.close ();//Close File -  the     { -Std::fstream Fio ("F:\\1.txt", Std::ios::inch| Std::ios:: out);//reopen the file, the file pointer starts from the beginning -  -          for(inti =0; I <4; i++)//Read +         { -             Charstr[ -] = {0 }; +Fio.getline (str, -); AStd::cout << str <<Std::endl; at         } -  -Fio.close ();//Close File -     } -          -System"Pause"); in}

2 Ifstream

Open input File stream

1#include <iostream>2#include <fstream>3 4 voidMain ()5 {6Std::ifstream Fin ("F:\\1.txt");//Create read file stream7 8     Charstr[ -] = {0 };9 TenFin >> str;//Read One  AFin.close ();//Close File -  -Std::cout <<str; the      -System"Pause"); -}

3 Ofstream

Open output File stream

Open file, write by line

Std::endl line break

1#include <iostream>2#include <fstream>3 4 voidMain ()5 {6 Std::ofstream Fout;7 8Fout.open ("F:\\1.txt");//Open the file, and if there is no file, a new file will be created9 TenFout <<"Hello"<< Std::endl;//Write, Std::endl line break OneFout <<" China"<<Std::endl; AFout <<"Hello"<<Std::endl; -Fout <<" World"<<Std::endl; -  theFout.close ();//Close File -  -System"Pause"); -}

#include <fstream>