C++ 文件读写

程序中常用语句：

#include<fstream>

#include<iostream>

#include<string>

using namespace std;

ifstream fin；

fin.open(filename);

ofstream fout;

fout.open(filename);

if(fin.is_open()){

cout<<"Open file success!"<<endl;

}

while(!fin.eof()){

string str; 

getline(cin,str);

fout<<str;

}

fin.close();

fout.close();