Undefined reference

[DarrinTE]

Hello, I know the code is correct but for some reason when I compile the code it says "[Linker error] undefined reference to 'myFun::add(int,int)'" . I am compiling in Dev c++. Here is my code:
Functions.h

#ifndef TESTCLASS_H
#define TESTCLASS_H
#include <iostream>
using namespace std;

class myFun
{
      public:
             int add(int x, int y);
};
#endif 

Functions.cpp

#include <iostream>
using namespace std;
#include "Functions.h"

int myFun::add(int x, int y)
{
   return x+y; 
}

text.cpp

#include <iostream>
using namespace std;
#include "Functions.h"
int main()
{
   int pause; 
   myFun ignite;
   cout<<ignite.add(2,4);
   cin>>pause;
}

Also I did notice in the file the header file "Functions.h" is saved as a C Header File where the rest of the files are C++ Source File. How do I change Functions.h to a C++ Header File and do I have to change it?

[Computergeek01]

Is "Functions.cpp" linked in your project? Check "Project -> Remove From Project" at the top of the IDE's window. If you do not see it listed the you need to add it with "Project -> Add to Project" which should be right above the other command.

Oh yeah, stop using Dev-C++, it's old and bad and stuff.

EDIT: Another way to do this is to go to: "Window -> List" this will pop-up with the files linked in your project.

[DarrinTE]

That fixed it thanks! What compiler would you suggest using?

[Computergeek01]

This will be the easiest for you to learn if you've already started with Dev-C++: http://wxdsgn.sourceforge.net/?q=node/4

This is a little buggy but a lot less so, and it is up to date.