reading from a file in c 2b 2b

1// reading a text file
2#include <iostream>
3#include <fstream>
4#include <string>
5using namespace std;
6
7int main () {
8  string line;
9  ifstream myfile ("example.txt");
10  if (myfile.is_open())
11  {
12    while ( getline (myfile,line) )
13    {
14      //use line here
15    }
16    myfile.close();
17  }
18
19  else cout << "Unable to open file"; 
20
21  return 0;
22}

1// basic file operations
2#include <iostream>
3#include <fstream>
4using namespace std;
5
6int main () {
7  ofstream myfile;
8  myfile.open ("example.txt");
9  myfile << "Writing this to a file.\n";
10  myfile.close();
11  return 0;
12}

1/ fstream::open / fstream::close
2#include <fstream>      // std::fstream
3
4int main () {
5
6  std::fstream fs;
7  fs.open ("test.txt", std::fstream::in | std::fstream::out | std::fstream::app);
8
9  fs << " more lorem ipsum";
10
11  fs.close();
12
13  return 0;
14}

1int a, b;
2    
3ifstream bd; 
4myfile.open("file.txt");
5
6if (myfile.is_open())
7	while (bd >> a >> b)
8    	cout << a << b << endl;
9
10else cout << "ERROR";

1#include <iostream>
2#include <fstream>
3using namespace std;
4int main() {
5	fstream my_file;
6	my_file.open("my_file.txt", ios::in);
7	if (!my_file) {
8		cout << "No such file";
9	}
10	else {
11		char ch;
12
13		while (1) {
14			my_file >> ch;
15			if (my_file.eof())
16				break;
17
18			cout << ch;
19		}
20
21	}
22	my_file.close();
23	return 0;
24}
25