1.7writing and reading files

// Ess1.7.cpp : 定义控制台应用程序的入口点。

//

 

#include "stdafx.h"

#include <fstream>

#include <iostream>

#include <string>

#include <sstream>

 

using namespace std; 

 

int _tmain(int argc, _TCHAR* argv[])

{

//ofstream outfile("seq_data.txt", ios_base::app);

ofstream outfile("seq_data.txt");

for( int i = 0; i < 10; i ++ ){

stringstream i_tos;

i_tos<<i;

string user_name = "wind" + i_tos.str();

string user_pwd = "wind";

 

if( !outfile){

cerr<<"oops, Unable to save session data!";

}else{

outfile << user_name << ' '

<< user_pwd << endl;

}

}

 

ifstream infile("seq_data.txt");

 

if( !infile ){

cerr<<"can't open file!";

}else{

string name = "", pass = "";

while( (infile >> name) && (infile >> pass) ){

cout<<name<<"------"<<pass<<endl;

}

}

 

 

return 0;

}