Input/Output with files

The following is a simple program to show reading, writing and appending to files. You can read more about this feature at cplusplus.com.

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
  string line;
  cout<<"\nFile 1 operations - Writing to Hello.txt"<<endl;
  ofstream file1; //OUTPUT file Stream
  file1.open("Hello.txt"); //Open the file
  file1 << "Writing something something to a file"<<endl;
  file1 << "This is enough for the time being"<<endl;

  if(file1.is_open()) //Check if open
  {
    /*
    while (!file1.eof())
    {
      getline (file1,line); - NOT POSSIBLE because of ofstream
      cout << line << endl;
    }
    */
  }
  file1.close(); //Close file1

  cout<<"\nFile 2 operations - Reading from Hello.txt"<<endl;
  ifstream file2; //INPUT file stream
  file2.open("Hello.txt"); //Open the file
  if(file2.is_open()) //Check if open
  {
    while (!file2.eof())
    {
      getline (file2,line);
      cout << line << endl;
    }
  }
  file2.close(); //Close file2


  cout<<"\nFile 3 operations - Appending and Reading from Hello.txt"<<endl;
  fstream file3; //INPUT file stream
  file3.open("Hello.txt", ios::in | ios::out); //Open the file
  if(file3.is_open()) //Check if open
  {
    //We want to put a new line at the end of the file
    file3.seekp(0, ios::end);
    file3 << "This is new line added file 3"<<endl;
    //Now reset the file pointer to the start of the file
    file3.seekg(0, ios::beg);
    while (!file3.eof())
    {
      getline (file3,line);
      cout << line << endl;
    }
  }
  file3.close(); //Close file3

  return 0;
}

The output is as follows: