Problems with string declarations in C++

Hello
I have a problem with stings... i can't declare it.
For example, this code:

Code:

---

#include <iostream.h>
#include <string.h>

int main()
{
  string s;
  return 0;
}

---

will generate an error:
Undefined symbol 'string'

What do i have to do to use strings? I am sorry for this question, but i am kind of new to c++.

Thanks

I think you should try this:

Code:

---

#include <iostream>
#include <string>

int main()
{
    std::string s;
    return 0;
}

---

So include newer header files with no ".h" and use the right namespace. Alternatively put "using namespace std;" after #includes if you like to avoid "std::".

I hope it helps.

Thanks for help.
But now it says:
Unable to open include file 'IOSTREAM'
Unable to open include file 'STRING'
Type qualifier 'std' must be a struct or class name.

If i write
using namespace std;

it says Declaration syntax error.

What is the problem?

The proposed solution seems to work in case of particular compilers, like Visual Studio. I think you should specify which kind of compiler you are using.

What compiler are you using? if your compiler doesn't recognise namespaces, then you need to download a new compiler which conforms to the latest version of the C++ standard. (There are plenty of excellent free compilers available - see the FAQ for details)

incidentally, <iostream> and <string> are case-sensitive, so make sure you type them in lowercase letters.

I use Borland C++ version 3.1. I have never thought that i should change the compiler. Where can i get a new one?
Thanks

You sure. That shouldn't happen!

Code:

---

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string s;
    return 0;
}

---

try copying that and see if it still errs

I think STL and namespaces are not supported by Borland C++ 3.1.

Maybe you should try other compiler? For instance you can try Visual Studio 2005 from http://msdn.microsoft.com/vstudio/ex...d/default.aspx. Dev-C++ is another choice: http://www.bloodshed.net/devcpp.html.

It's not working. It says 'Declaration syntax error' and it points to 'using namespace std''

According to Wikipedia, Turbo C++ 3.1 was launched shortly after Windows 3.1 first hit the road. You are using an antique compiler, qmadd.

You may want to change it. Popular free choices for windows are:

MinGW
Visual C++ 2005 Express Edition
Digital Mars C++
Comeau C++

These are probably by order. If you go with MinGW you may want to download either Bloodshed Dev-C++ or Code::Blocks. These are popular choice free IDEs that can be downloaded with the MingW compiler and GDB debugger for ease of installation.