C++ Using Header File Error

[YourFace]

I'm currently using Dev-Cpp, and it gives me this error whenever I'm including the header file in the main func.
here's the code to the three files
Using Header Files.cpp(this is the file name)

#include <iostream>
#include <stdlib.h>
#include <string>
using namespace std;
#include "security_code.h"
int main()
{
    cout <<"Danger Danger, you need the super secret security code" << endl;
    cout <<"The code is " << endl;
    cout << TheCode(15) << endl;
    return 0;
}

security_code.h (this is the file name)

string TheCode(int Code);//function prototype

security_code.cpp

#include <string>

string TheCode(int Code)
{
       return "20-20-20";
       }

whenever I compile this, it highlights the line #include "security_code.h" in red
I don't know why it's considerred an error though =/
Does anyone know how to include the header file and make this work?
here's the error code

Spoiler

Compiler: Default compiler
Building Makefile: "C:\Users\Garry\Desktop\New folder (2)\c++ exersises\Makefile.win"
Executing make...
make.exe -f "C:\Users\Garry\Desktop\New folder (2)\c++ exersises\Makefile.win" all
g++.exe -c "Using Header Files.cpp" -o "Using Header Files.o" -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include"

Using Header Files.cpp:5:27: security_code.h: No such file or directory
Using Header Files.cpp: In function `int main()':
Using Header Files.cpp:10: error: `TheCode' undeclared (first use this function)
Using Header Files.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)

make.exe: *** ["Using Header Files.o"] Error 1

Execution terminated

 

[Xienoph]

I haven't used Dev-Cpp, but where is your security_code.h located relative to Header Files.cpp? Are they in the same directory?

 

[YourFace]

it's in the same file as the project and the .cpp file.
Everything is saved to the same folder

 

[Samael88]

I am also using dev-c++^^
It would help if you posted the top of the .h file you've made.

It could be that it is case sensitive.
I always declare my own header files like this:

#ifndef MAPENGINE_H
#define MAPENGINE_H

//My code here

#endif

In the cpp file:

#include <iostream.h>
#include "MAPENGINE.h"

Notice the caps of the name^^

Edit: Oh, and the file name is not case sensitive^^ My file name is "MapEngine.h"

 

[GetTriggerUnit-]

Put the namespace declaration after all the includes.

#include <iostream>
#include <stdlib.h>
#include <string>
#include "security_code.h"

int main()
{
    using namespace std;
    cout <<"Danger Danger, you need the super secret security code" << endl;
    cout <<"The code is " << endl;
    cout << TheCode(15) << endl;
    return 0;
}

or

#include <iostream>
#include <stdlib.h>
#include <string>
#include "security_code.h"

using namespace std;

int main()
{
    cout <<"Danger Danger, you need the super secret security code" << endl;
    cout <<"The code is " << endl;
    cout << TheCode(15) << endl;
    return 0;
}

 

[YourFace]

I am also using dev-c++^^
It would help if you posted the top of the .h file you've made.

It could be that it is case sensitive.
I always declare my own header files like this:

#ifndef MAPENGINE_H
#define MAPENGINE_H

//My code here

#endif

In the cpp file:

#include <iostream.h>
#include "MAPENGINE.h"

Notice the caps of the name^^

Edit: Oh, and the file name is not case sensitive^^ My file name is "MapEngine.h"

lol, that was all the header file had. I didn't include any #includes or anything since the book didn't tell me anything about that.
The book itself didn't even have any includes either!
I'll try using the #ifndef
#define
includes that you listed and see if it works

 

[LocalDude]

#ifndef MAPENGINE_H
#define MAPENGINE_H

//My code here

#endif

The #ifndef and #define are called header guards they prevent the compiler from including the piece of code more then once.

I copied the code you provided in to a dev project and it worked, as said before the problem is probably that you have it in separate folders or dev cpp is not configured right