C++ Program To Read A Line By Line And Write Line By Line Using File

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
  string line;
  ifstream myfile ("example.txt");
  if (myfile.is_open())
  {
    while ( getline (myfile,line) )
    {
      //use line here
    }
    myfile.close();
  }
  else cout << "Unable to open file";
  return 0;
}