Sample of C++ read/write a text file

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    const char *filename = "t.txt";
    ofstream ofile;
    ifstream ifile;
  
    //write
    ofile.open(filename);
    ofile << "111111111111" << endl;
    ofile << "222222222222" << endl;
    ofile.close();
  
    //read
    string str;
    ifile.open(filename);
    while(ifile >> str)
        cout << str << endl;
    ifile.close();
  
    return 0;
}