Re: [SLUG] C++ newbie terrors - the program that won't compile

[James Gregory <james@xxxxxxxxxxx>]

On Thu, Nov 25, 2004 at 08:30:53AM +1100, Nicholas Tomlin wrote:
> Hell sluggers,

Right on.

> ** error message:
> [...]
> 
> ** I'm not worried about the antiquated header, The syntax is the issue. I've 
> tried all sorts of mods to the syntax and cannot get it to go away, the 
> program is a 'cut and paste' straight out of a text book, but it does not 
> work! (while student is programming; writeln f..k). 

The header isn't antiquated, you don't put the .h on C++ includes. The
.h variant doesn't use namespaces, if you do

    #include <iostream>

your header warning will go away. You'll then get a new error, because
you haven't either specified the std namespace for all the std stuff
you're using, nor specified that you want the namespace imported
(assuming you're running a vaguely recent version of g++). So, you can
either do this kinda thing:

    std::cout << ...

or put this at the top of the file somewhere:

    using namespace std;

Have you intentionally dropped the arguments from main()? Anyway, you
probably want something like this:

    #include <iostream>
    
    using namespace std;
    
    int main(int argc, char *argv[]) {
        int x = 5;
        int y = 7;
        cout << x + y << " " << x * y << endl;;
        return 0;
    }

> I assume this is normal practice, to publish inaccurate and unusable
> programs so some schmuck spends hours sorting it out...

The error you were getting was a missing <<. I'd double check that. The
issue with your header files is probably the age of your references.
There was a long time where g++ would just ignore namespaces and there's
a lot of reference material that still ignores this fact.

HTH,

James.

-- 
"Now, there are no problems  only opportunities. However, this seemed to be an
insurmountable opportunity."
 - http://www.surfare.net/~toolman/temp/diagram.html