strange errors when compiling.

Hi folks,

I am new to this forum. Am 25 years old, I am working in the computer-area for about 9 years now (if you count my aprenticeship) but never got the hang of programming myself.

Sure, I had the basics about C and Java2 and stuff, but never really got over that.

So I thought I'd start with programming anew, and found this site.

When I try to compile the first Program of the first lesson:

Code:

#include <iostream>

using namespace std;

int main()
{
  cout<<"HEY, you, I'm alive! Oh, and Hello World!\n";
  cin.get();
}

I get a strange error.

This is what I do:

- type the above with nano on the command-line (am on MacOSX now, but I did this with Linux too to confirm the error)
- save it as hello.cpp
- exit nano
- execute "gcc hello.cpp" or "gcc hello.cpp -o hello"
- I get the following:

Code:

bash-3.2$ gcc hello.cpp 
Undefined symbols:
  "___gxx_personality_v0", referenced from:
      ___gxx_personality_v0$non_lazy_ptr in cciNlgWN.o
  "std::basic_istream<char, std::char_traits<char> >::get()", referenced from:
      _main in cciNlgWN.o
  "std::ios_base::Init::~Init()", referenced from:
      ___tcf_0 in cciNlgWN.o
  "std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
      _main in cciNlgWN.o
  "std::ios_base::Init::Init()", referenced from:
      __static_initialization_and_destruction_0(int, int)in cciNlgWN.o
  "std::cin", referenced from:
      __ZSt3cin$non_lazy_ptr in cciNlgWN.o
  "std::cout", referenced from:
      __ZSt4cout$non_lazy_ptr in cciNlgWN.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
bash-3.2$

What seems to be the problem??

I simply have no clue whatsoever!

Thx for any help, will be apreciated!

twilight

You need to run g++ hello.cpp.

Your code is C++, not C. gcc is the C compiler, g++ is the C++ compiler.

I feel kind of stupid now because I usualy know stuff like that.

Used to use Gentoo-Linux for years and compiling sources and whatnot... :-D

thx, that was it.

does your int main() function return nothing?

i think it have to look like this:

Code:

#include <iostream>

using namespace std;

int main()
{
  cout<<"HEY, you, I'm alive! Oh, and Hello World!\n";
  cin.get();
  return 0;
}

good luck!

Jelte,

does your int main() function return nothing?

i think it have to look like this:

No, C++ implicitly returns 0 from main() if there is no explicit return statement. His code is correct as it is.

@bithub ok. nice to know

yeah, the code should be ok. It is the one right from the tutorial :-D

but thx for your reply! As I said before: it is alright now! Using g++ instead of gcc it worked.

Do not blindly rely on tutorials, however. A lot of them spew out bad practices.

like:

using namespace std;