Re: [gentoo-dev] Need some c++ help here please:

[Thomas T. Veldhouse]

The standard way to do it these days is to use the standard library, which is 
in the standard namespace.

You should probably only use the parts of the standard namespace that you need 
to avoid namespace collisions.  So ...

#include <iostream>
using std::cout;
using std::endl;
// you could comment out the above to lines if you are lazy and uncomment 
// the following line
// using namespace std;

int main(int, char**) {
	cout << "Hello World" << endl;
	return 0;
}

Tom Veldhouse
veldy@×××××.net

On Monday 26 August 2002 09:42 am, Spider wrote:
> cat hiworld.cpp
> #include <iostream.h>
> int main(){
>         cout << "Hello World" << endl;
>         return(0);
> }
>
>
> Old standard, but should work afaik...
>
> gcc -dumpversion
> 3.2
>
> c++ -dumpversion
> 3.2
>
>
>
> spider@Darkmere> gcc -o hiworld hiworld.cpp
> In file included from /usr/include/g++-v32/backward/iostream.h:31,
>                  from hiworld.cpp:1:
> /usr/include/g++-v32/backward/backward_warning.h:32:2: warning: #warning
> This file includes at least one deprecated or antiquated header. Please
> consider using one of the 32 headers found in section 17.4.1.2 of the
> C++ standard. Examples include substituting the <X> header for the <X.h>
> header for C++ includes, or <sstream> instead of the deprecated header
> <strstream.h>. To disable this warning use -Wno-deprecated.
> /tmp/ccKgk3Jj.o: In function `main':
> /tmp/ccKgk3Jj.o(.text+0x13): undefined reference to `std::cout'
> /tmp/ccKgk3Jj.o(.text+0x20): undefined reference to
> `std::basic_ostream<char, std::char_traits<char> >& std::operator<<
> <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*)'
> /tmp/ccKgk3Jj.o(.text+0x2b): undefined reference to
> `std::basic_ostream<char, std::char_traits<char> >& std::endl<char,
> std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char>
>
> >&)'
>
> /tmp/ccKgk3Jj.o(.text+0x30): undefined reference to
> `std::basic_ostream<char, std::char_traits<char>
>
> >::operator<<(std::basic_ostream<char, std::char_traits<char> >&
> >
> >(*)(std::basic_ostream<char, std::char_traits<char> >&))'
>
> /tmp/ccKgk3Jj.o: In function
> `__static_initialization_and_destruction_0(int, int)':
> /tmp/ccKgk3Jj.o(.text+0x59): undefined reference to
> `std::ios_base::Init::Init[in-charge]()'
> /tmp/ccKgk3Jj.o: In function `__tcf_0':
> /tmp/ccKgk3Jj.o(.text+0x8a): undefined reference to
> `std::ios_base::Init::~Init [in-charge]()'
> /tmp/ccKgk3Jj.o(.eh_frame+0x11): undefined reference to
> `__gxx_personality_v0'
> collect2: ld returned 1 exit status
>
> spider@Darkmere> c++ -o hiworld hiworld.cpp
>                                           /tmp/dd
> In file included from /usr/include/g++-v32/backward/iostream.h:31,
>                  from hiworld.cpp:1:
> /usr/include/g++-v32/backward/backward_warning.h:32:2: warning: #warning
> This file includes at least one deprecated or antiquated header. Please
> consider using one of the 32 headers found in section 17.4.1.2 of the
> C++ standard. Examples include substituting the <X> header for the <X.h>
> header for C++ includes, or <sstream> instead of the deprecated header
> <strstream.h>. To disable this warning use -Wno-deprecated.
>
>
>
>
> But this works.... .
>
> Now.. what am I missing here???
>
> //Spider