Why doesn't my code work?

Question

Hi everyone!
I created this c++ code and separated the header and the source files but it doesn't work.
I keep receiving this error:
||=== Build: Debug in composition (compiler: GNU GCC Compiler) ===|
obj\Debug\main.o||In function `main':|
D:\coding files\C++\CodeBlocks\composition seperate files\main.cpp|8|undefined reference to `name::name(std::string)'|
D:\coding files\C++\CodeBlocks\composition seperate files\main.cpp|10|undefined reference to `name::print_name()'|
||error: ld returned 1 exit status|
||=== Build failed: 3 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

Take a look at my code:

main.cpp
-------------------------
#include <iostream>
#include <string>
#include "name.h"
using namespace std;

int main()
{
name obj("John");

obj.print_name();

return 0;
}
----------------
name.h
----------------
#ifndef NAME_H
#define NAME_H
#include <iostream>
#include <string>
using namespace std;

class name
{
public:
name(string n);
void print_name();

private:
string name_str;
};

#endif // NAME_H
------------------------
name.cpp
------------------------
#include "name.h"
#include <iostream>
#include <string>
using namespace std;

name::name():name_str(n){}

void name::print_name()
{
cout<<"name: "<<name_str<<endl;
}

Answer 1

In name.cpp's constructor, n is undefined

You probably want something like
name::name(std::string n):name_str(n) {}

Answer 2

I will have a proper look when I get home :) that was just the first thing that jumped out at me

Answer 3

Thanks but it still doesn't work