File IO

• Reading from the keyboard is called interactive I/O
• We can read from a file as well.
  • File I/O
  • Mostly the same as interactive.
  • #include <fstream>
  • Two new "types"
    • ifstream - input file stream
    • ofstream - output file stream
  • Some new functions
    • stream.open(filename);
    • stream << or >>
    • stream.close();
    • See this file input example
    • See this file output example
  • Note it the above examples we did stream.open("name");
  • Would this work ?:

  • ...
    ofstream afile;
    istring filename;
    
    filename = "myfile.dat"
    afile.open(filename);
    ...
    
    	

  • How about this one?

  • ...
    ofstream afile;
    istring filename;
    
    cout << "Enter the file you wish to open"; 
    cin >> filename
    cout << "Opening " << filename << endl;
    afile.open(filename);