cout i c++ på linux platform

Alt i iostream ligger i namespace std. Prøv at skrive
#include <iostream>
using namespace std;
void ...

Du skal have fat i ofstream og ikke ostream

Se her (fra MSDN men det er ANSI C++):

ofstream:

Construction/Destruction — Public Members

ofstream
Constructs an ofstream object.

~ofstream
Destroys an ofstream object.

Operations — Public Members

open
Opens a file and attaches it to the filebuf object and thus to the stream.

close
Flushes any waiting output and closes the stream’s file.

setbuf
Associates the specified reserve area to the stream’s filebuf object.

setmode
Sets the stream’s mode to binary or text.

attach
Attaches the stream (through the filebuf object) to an open file.
Status/Information — Public Members

rdbuf
Gets the stream’s filebuf object.

fd
Returns the file descriptor associated with the stream.

is_open
Tests whether the stream’s file is open.