Simple file input question?

Code:

if (myfile.is_open())
  {
    while (! myfile.eof() )
    {
      for(int b=0;b<PlayListLength;b++)
      {
      getline (myfile,line);
      Title = line;
      getline (myfile,line);
      Artist = line;
      getline (myfile,line);
      Length = line;
      Playlist[b] = new Mp3(Title, Artist, Length);
      }
    }

To read from a file and use three lines at a time to create a new mp3 within an array. I need the third value (Length) to be read as an int instead of a string.

Can anyone help?!

Thank you very much.

Leigh Rogers