#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;
int main (void)
{
// file.txt;
ofstream fout("file.txt");
int ival;
cout << "enter integer value: ";
cin >> ival;
fout << setw(10) << setfill('0') << showpos << internal << ival << endl;
double dval;
cout << "enter double value: ";
cin >> dval;
fout << fixed << dval << endl;
string str;
cout << "enter string: ";
cin >> str;
fout << str << endl;
return 0;
}
6.2. .
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main (void)
{
// file.txt;
ifstream fin("file.txt");
int ival;
double dval;
string str;
fin >> ival >> dval >> str;
cout << ival << endl << dval << endl << str << endl;
return 0;
}
6.2.
, .
6.1. ifstream.
| gcount | , |
| get | |
| ignore | , |
| peek | |
| putback | |
| read | |
| seekg | |
| tellg | |
| eof | |
| open | , |
| close | , |
6.2. ofstream.
| flush | |
| put | |
| seekp | |
| tellp | |
| write | |
| open | , |
| close | , |
6.3. .
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main (void)
{
string buf;
// file.txt;
ofstream fout("file.txt");
// ;
getline(cin, buf);
// file.txt;
fout << buf;
// , ;
fout.close();
// file.txt;
ifstream fin("file.txt");
// file.txt ;
|
|
|
while (!fin.eof())
cout << static_cast<char>(fin.get());
cout << endl;
// , ;
fin.close();
return 0;
}
6.3.
, . , .
6.3. .
| badbit | |
| eofbit | |
| failbit | |
| goodbit | |
| hardfail |
6.4. .
| eof | eof |
| fail | badbit failbit, hardfail |
| bad | badbit hardfail |
| good | goodbit |
| clear |
6.4.
, , , . , . , , .
6.5. .
| in | ( ifsteream) |
| out | ( ofsteream) |
| ate | |
| app | |
| trunc | , |
| nocreate | , |
| noreplace | ate app |
| binary |
