GCC:- 'cout' is an undeclared function when #include <iostream> is included?

caesius_01 · 04-02-2004, 11:52 PM

I'm getting the GCC compiler to work and have just scribbled this code for a test:

#include <iostream>

int main() {
int a;
a = 5;
cout << a;

return 0;
}

But low and behold I recieve the message: "In function 'int main()': 'cout' undeclared (fisrt use this fuction) (Each undeclared......" and so forth.

Why is cout and cin not recognised when "#include <iostream> is present. Maybe I'm doing something wrong...probably am. Help appreciated.

320mb · 04-03-2004, 12:28 AM

Code:

#include <iostream>

int main() {
int a;
a = 5;
std::cout << a; 

return 0;
}

Komakino · 04-03-2004, 05:49 AM

or:

Code:

#include <iostream>

using namespace std;

int main() {
   int a;
   a = 5;
   cout << a; 

   return 0;
}

BooKA. · 04-04-2004, 10:09 AM

Quote:

#include <iostream>

using namespace std;

int main() {
int a;
a = 5;
cout << a;

return 0;
}

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

Defining these at the top give you access to just typing:

cout << "Whatever";

etc.

Mega Man X · 04-04-2004, 10:26 AM

Or:

#include<iostream.h>

kev82 · 04-04-2004, 11:00 AM

although for the majority of c++ headers the only difference between the <name> and <name.h> versions is the use of the std namespace there are some significant differences between iostream and iostream.h, you should not use iostream.h