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

int main()
{
    // a "stream" is a sequence of data that
    //   you read or write
    // e.g. cin is an "input stream"
    // e.g. cout is an "output stream"
    // e.g. cerr is an "output stream"

    // stream operators are << and >>
    //   >> reads the next item
    //   << writes the next item
    cout << "Please tell me your name: ";
    string name;
    cin >> name;
    cout << "Hello, " << name << endl;

    // create an input file stream
    // we will use ifstream (requires <fstream> library)
    ifstream infile;

    // try to open the file
    infile.open( "ints.txt" );
      // assumes file is located in the
      //   "current working directory"
      //   (e.g. project folder in Visual Studio)

    int x;
    // keep reading integers from the file
    //   until EOF (end-of-file)
    while ( infile >> x )
    {
        cout << "Read " << x << endl;
    }

    infile.close();  // free up oper sys resources
    cout << "All done reading from file.\n";


    // write to a file using ofstream
    //   (requires the <fstream> library)
    ofstream outfile;

    // try to open (create) the file for writing
    outfile.open( "output.txt" );
      // this will OVERWRITE any existing file

    outfile << "Hello again, " << name << ".\n\n";
    outfile << "Last number read from file was "
            << x << endl;

    outfile.close();
    cout << "All done writing to new file.\n";


    return 0;
}