pblm with std::cout while compiling

adilturbo · 06-10-2006, 08:23 AM

i have mandrake 10.1 linux OS and gcc-3.4.1-4mdk version.

so i wrote just a sample prog to test gcc ,in that prog i used

Quote:

std::cout<<"hello"<<'\n';

instruction.
so while compiling i got messages telling errors with std
like this:

Quote:

[root@localhost adil]# gcc cpp/class.cpp -o class
In file included from cpp/class.cpp:2:
cpp/class.h:22:3: warning: no newline at end of file
cpp/class.cpp:7:2: warning: no newline at end of file
/root/tmp/ccpxKxtZ.o(.text+0xd): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const'
/root/tmp/ccpxKxtZ.o(.text+0x60): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >:

perator[](unsigned int) const'
/root/tmp/ccpxKxtZ.o(.text+0x9d): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >:

perator[](unsigned int) const'
/root/tmp/ccpxKxtZ.o(.text+0xc8): In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
: undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >:

perator[](unsigned int) const'
/root/tmp/ccpxKxtZ.o(.text+0x154): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `std::ios_base::Init::Init()'
/root/tmp/ccpxKxtZ.o(.text+0x183): In function `__tcf_0':
: undefined reference to `std::ios_base::Init::~Init()'
/root/tmp/ccpxKxtZ.o(.gnu.linkonce.t._ZN1a4drawEv+0x14): In function `a::draw()':
: undefined reference to `std::cout'
/root/tmp/ccpxKxtZ.o(.gnu.linkonce.t._ZN1a4drawEv+0x19): In function `a::draw()':
: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std:

perator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/root/tmp/ccpxKxtZ.o(.gnu.linkonce.t._ZN1a4drawEv+0x22): In function `a::draw()':
: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std:

perator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char)'
/root/tmp/ccpxKxtZ.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

plz i need some help. thank u

worzel68 · 06-10-2006, 08:36 AM

Do you have the code

Quote:

using namespace std

near the top of you file ?

You could use cout without the std:: namespace resolution operator, provided you inclide the stdio header file like this:

#include <stdio>

Does this help ? If not send us some code.

Cheers.

adilturbo · 06-10-2006, 08:50 AM

no sorry. the same pblm exist.

i used the

Quote:

using namespace std;

instruction before,
i got the same messages, itried with including the stdio header file,
the same problem.
is there an other solustion?

worzel68 · 06-10-2006, 08:55 AM

Can you send some of your code? If it is too big then send the first page with the includes and then the lines surrounding the std::cout call.

Nylex · 06-10-2006, 09:09 AM

You should be using g++ to compile C++ code.

worzel68 · 06-10-2006, 09:21 AM

Here is some code I found in KDevelop Documentation

Quote:

#include <iostream>

using namespace std;

int main()
{
int ival;
char sval[30];

cout << "Enter a number:" << endl;
cin >> ival;
cout << "And now a string:" << endl;
cin >> sval;

cout << "The number is: " << ival << endl
<< "And the string is: " << sval << endl;
}

Apologies, I told you about the wrong include file.

Oh Yeah, as Nylex says using g++ - that would be really good!!!

adilturbo · 06-10-2006, 10:32 AM

thank u so much .
it works now with g++.
thank u again Nylex and worzel68

RoughEdge · 06-12-2006, 07:56 AM

I am sure that when using

Code:

 #include <iostream>

You need to use

Code:

 #include <iostream>

using namespace std;

….
….

If you leave out the using namespace std, then you will always need to use std::cout.

You can also use #include <iostream.h>, which negates the need to use the using namespace std; but I am sure that it is better practice to use <iostream>, I think that is the proper C++ header as opposes to a C header. I have never used <iostream.h> on linux so am unsure if it is included.

Hope that helps