C++ compile error

[Harley D. Eades III]

On Fri, 2005-12-16 at 10:41 -0500, Louis J. LeBlanc wrote:
> On Fri, December 16, 2005 10:33 am, Nathan Vidican wrote:
> > David Miao wrote:
> >> Dear list,
> >>
> >> I try to compile a hello world C++ program in FreeBSD 6.0, but get an
> >> error as below:
> >>
> >> [dm at ORION ~/cpp]% CC -o hello hello.C
> >> hello.C: In function `int main()':
> >> hello.C:5: error: `cout' undeclared (first use this function)
> >> hello.C:5: error: (Each undeclared identifier is reported only once
> >> for each function it appears in.)
> >> hello.C:5: error: `endl' undeclared (first use this function)
> >>
> >> I noticed that "iostream" file is located in
> >> "/usr/include/c++/3.4/iostream", I guess my CC compiler cannot find
> >> this head file. Is it true? And how can I fix this problem? Your
> >> advice is appreciated. Thanks in advance.
> >>
> >> ==quote of hello world code==
> >> #include <iostream>
> >>
> >> int main()
> >> {
> >>     cout << "Hello World!" << endl;
> >>
> >>     return 0;
> >> }
> >> == end of quote==
> >>
> >> Regards,
> >> David
> >> _______________________________________________
> >> freebsd-questions at freebsd.org mailing list
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> >>
> >>
> >>
> >
> > Also, noticed your code is flawed, you never used a namespace, nor
> > explicitly stated one. cout is part of the 'std' namespace, so either
> > ' using namespace std;' for global/local use of namespace, OR do
> > 'std::cout <<' instead. Try the hello.cpp I sent you in the last email,
> > that one should work for ya :)
> 
> I'm not nearly as adept with C++ as I am with C, Perl, and a few other
> geek tools, but doesn't C++ default to the std namespace if none is
> specified?
> 
> Perhaps this is a compiler specific behavior?
No, you have to either tell the compiler by using "std::METHOD" or say
using namespace std; to annouce you are using std as your primary
namespace.

-- Harley 
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