I was just playing around with cpplint and tried running it on some code I had written for fun. I realized that the following lines were flagged with the error message :-

```
#include <iostream>
...
#include <fstream>

yoohoo.cpp:3:  Streams are highly discouraged.  [readability/streams] [3]
yoohoo.cpp:5:  Streams are highly discouraged.  [readability/streams] [3]

```

I'm curious about why using streams is discouraged.