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Old 04-18-2003, 03:38 AM   #1
Registered: Aug 2002
Location: Egypt
Distribution: Debian Sarge, Slackware 10.0
Posts: 163

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gcc3 and RH 8

I have Redhat 8, and want to compile my C++ programs using g++.
But when, for instance, I try to compile this program (using g++ test.cpp -o test) :
#include <iostream>
int main() {
        cout << "hi";
return 0;
It prints out this error:
test.cpp: In function `int main()':
test.cpp:3: `cout' undeclared (first use this function)
test.cpp:3: (Each undeclared identifier is reported only once for each function
it appears in.)
I think the problem here is that it can't find iostream.h. I did a locate for iostream.h and I found all gcc header files at /usr/include/c++/3.2.
How can I solve this problem ?
Thank you
PS: gcc 3 takes too long compiling : 7 secs to compile this tiny program above. but when i had mandrake and gcc 2.96 it took 0.5 seconds compiling it... strange?
Old 04-18-2003, 05:34 AM   #2
Registered: Oct 2002
Location: Sydney, Australia
Distribution: Gentoo, Ubuntu, Debian
Posts: 184

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#include <iostream>

using namespace std;

int main() {
cout << "hi";
return 0;

You need to look for cout within the std namespace if you include the iostream lib like that.... shouldn't this thread be in programming?
Old 04-18-2003, 05:47 AM   #3
Senior Member
Registered: Nov 2002
Location: CA
Distribution: redhat 7.3
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or just do this:

#include <iostream.h>

wouldn't that solve the problem as well?

It works on my machine .... i have redhat 7.3
Old 04-20-2003, 04:51 AM   #4
Registered: Oct 2002
Location: Sydney, Australia
Distribution: Gentoo, Ubuntu, Debian
Posts: 184

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Yes, but that way is not ANSI C++ compliant, and it's possible it may not work on some ANSI C++ compilers.
Old 04-20-2003, 04:04 PM   #5
LQ Guru
Registered: Jan 2003
Location: Turkey&USA
Distribution: Emacs and linux is its device driver(Slackware,redhat)
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or another option use cout like that

std::cout<<"hello world\n";


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