Файловый ввод-вывод

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main()
{
 ifstream infile("in_file");
 ofstream outfile("out_file");
 if ( ! infile ) {
 cerr << "Îøèáêà îòêðûòèÿ âõîäíîãî ôàéëà.\n"
 return -1;
}
 if ( ! outfile ) {
 cerr << "Îøèáêà îòêðûòèÿ âûõîäíîãî ôàéëà.\n"
 return -2;
}
 
 string word;
 while ( infile >> word )
 outfile << word << ' ';
 system ("pause");
 return 0;
}

 D:\DEV\×èòàåò èç ôàéëà è ââîäèò â ôàéë\main.cpp In function `int main()': 
14 D:\DEV\×èòàåò èç ôàéëà è ââîäèò â ôàéë\main.cpp expected `;' before "return" 
18 D:\DEV\×èòàåò èç ôàéëà è ââîäèò â ôàéë\main.cpp expected `;' before "return" 
 D:\DEV\×èòàåò èç ôàéëà è ââîäèò â ôàéë\Makefile.win [Build Error]  [main.o] Error 1

cerr << "Ошибка открытия входного файла.\n"

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() {
cout << "Enter you login: " << endl;
char login[50];
cin >> login;
{
 ifstream infile("in_file.txt");
 ofstream outfile("out_file.txt");
 if ( ! infile ) {
 cerr << "Error opening the input file" << endl;
 return -1;
}
 if ( ! outfile ) {
 cerr << "Error opening output file" << endl;
 return -2;
}
}
 while ( infile.txt >> login )
 outfile.txt << login << ' ';
 cout << "Enter a file is successful!" << endl;
 system ("pause");
 return 0;
}

24 D:\DEV\Òåñò òèïà èãðà êàðî÷\main.cpp `infile' undeclared (first use this function) 
  (Each undeclared identifier is reported only once for each function it appears in.) 
25 D:\DEV\Òåñò òèïà èãðà êàðî÷\main.cpp `outfile' undeclared (first use this function) 
 D:\DEV\Òåñò òèïà èãðà êàðî÷\Makefile.win [Build Error]  [main.o] Error 1

 while ( infile.txt >> login )
 outfile.txt << login << ' ';

while ( infile >> login )
 outfile<< login << ' ';

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() {
char login[50];
 cout << "Enter you login: " << endl;
 cin >> login;
 ifstream infile("login.txt");
 ofstream outfile("save.txt");
 while ( login >> login )
 save << login << ' ';
 system ("pause");
 return 0;
}

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() {
 string login;
 cout << "Enter you login: " << endl;
 cin >> login;
 ifstream infile("login.txt");
 ofstream outfile("save.txt");
 while ( login >> login )
 save << login << ' ';
 system ("pause");
 return 0;
}

14 D:\DEV\Òåñò òèïà èãðà êàðî÷\main.cpp no match for 'operator>>' in 'login >> login' 
15 D:\DEV\Òåñò òèïà èãðà êàðî÷\main.cpp `save' undeclared (first use this function)

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() 
{
    cout << "Enter you login: " << endl;
    char login[50];
    cin >> login;
 
    ifstream infile("in_file.txt");
    ofstream outfile("out_file.txt");
    if ( ! infile ) 
    {
        cerr << "Error opening the input file" << endl;
        return -1;
    }
 
    if ( ! outfile ) 
    {
        cerr << "Error opening output file" << endl;
        return -2;
    }
    
    while ( infile >> login )
        outfile << login << ' ';
    
    cout << "Enter a file is successful!" << endl;
     
    system ("pause");
    return 0;
}

#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() 
{
    char login[50];
    cout << "Enter you login: " << endl;
    cin >> login;
    
    ifstream infile("login.txt");
    ofstream outfile("save.txt");
    
    while ( infile >> login )
        outfile << login << ' ';
    
    system ("pause");
    return 0;
}

#include <cstdlib>
#include <fstream>
#include <string>
 
using namespace std;
 
int main() 
{
    char login[50];
    cout << "Enter you login: " << endl;
    cin >> login;
    
    //ifstream infile("login.txt");
    ofstream outfile("save.txt");
    
    //while ( infile >> login )
        outfile << login << ' ';
    
    system ("pause");
    return 0;
}