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#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
    string line;
    //create an output stream to write to the file
    //append the new lines to the end of the file
    ofstream myfileI ("input.txt", ios::app);
    if (myfileI.is_open())
    {
        myfileI << "\nI am adding a line.\n";
        myfileI << "I am adding another line.\n";
        myfileI.close();
    }
    else cout << "Unable to open file for writing";
  
    //create an input stream to write to the file
    ifstream myfileO ("input.txt");
    if (myfileO.is_open())
    {
        while ( getline (myfileO,line) )
        {
            cout << line << '\n';
        }
        myfileO.close();
    }
    
    else cout << "Unable to open file for reading";
    
    return 0;
}