G++ not finding in Ubuntu

Question

I just installed Ubuntu and tried making the famed "Hello World" program to make sure that all the basics were working. For some reason though, g++ fails to compile my program with the error: "'cout' is not a member of 'std'". I've installed the build-essential package. Am I missing something else?

#include <iostream.h>

int main() {
   std::cout << "Hello World!" << std::endl;
   return 0;
}

Looks pretty good to me...

please link to your tutorial or book, so we can spank the authors — KeatsPeeks, Dec 15 '09 at 23:10
Possible duplicate of [Why can't g++ find iostream.h?](https://stackoverflow.com/questions/13103108/why-cant-g-find-iostream-h) — phuclv, Aug 12 '18 at 11:27

score 17 · Accepted Answer · answered Dec 15 '09 at 23:02

17

Use #include <iostream> - iostream.h is not standard and may differ from the standard behaviour.

See e.g. the C++ FAQ lite entry on the matter.

answered Dec 15 '09 at 23:02

Georg Fritzsche

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score 6 · Answer 2 · 2009-12-15T23:07:50.700

6

The standard header is called <iostream>, not <iostream.h>. Also, it is agood idea to compile your C++code with the -Wall and -pedantic flags, which can point out lots of errors with non-standard code that g++ would otherwise ignore. Use:

g++ -Wall -pedantic myprog.cpp

edited Dec 15 '09 at 23:07

answered Dec 15 '09 at 23:02

score 3 · Answer 3 · answered Dec 15 '09 at 23:36

3

Sounds like it did find iostream.h but it does not define cout in the std namespace. It is there for backwards compatibility with older programs that expect cout to be in the global namespace.

answered Dec 15 '09 at 23:36

Kevin Panko

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score 0 · Answer 4 · answered Dec 02 '11 at 15:06

0

use

#include<iostream>
using namespace std;

without namespace you won't be able to use cout or cin

answered Dec 02 '11 at 15:06

kumar

11

G++ not finding in Ubuntu

4 Answers4