Multiple Files

[Lordieth]

Hey all.

I'm currently writing a program in C++ using Dev-C++ 4.9.9.2, and running into a few problems. My code has gotten rather large, and I decided to seperate some of my functions into a seperate sourcefile, and keep the function prototypes in a header file, following the tutorial to the letter - now when I try to compile it, I get a mess of errors, and i'm not sure what i'm doing wrong - even the tutorial does the same thing now!

The functions source file:

#include"OurHeader.h"

The header file:

#ifndef OURHEADER_H
#define OURHEADER_H

void Function1();
void Function2();

#endif

Main file:

#include"OurHeader.h"

Now as far as I can tell that's all correct - or is it? I'm in a bit of a mess really, if anyone can point to a correct way of doing multiple files in Devc++, or perhaps point me in the way of a working tutorial, i'd be very grateful - thankyou. I thought the problem might be because I wasn't using a project - so I attempted putting all the files into the project, and got the same errors, the errors are as follows:

1 [Warning] `nul.gcda' is not a gcov data file

Then a rather lengthy list of things apparantly not being declared, as if I hadn't included the right includes, which I have

[Valmont]

1) Start up your IDE.
2) Create a new project.
2b) A main cpp file is automatically created.
3) Go to: File->New->Source File.
3b) Select "OK" when dialog box asks if you would like to add this file to the current project.
4) Go to step 3 and 3b again.
5) Save them as "OurFile.hpp" and "OurFile.cpp".
6) Declare the functions in your header the way you did.
7) Define the functions in your source file and include the header obviously.
8) Include the header in main source file as well and then just use the functions.

main.cpp

#include "OurFile.hpp"
#include <iostream>

int main()
{
  Function1();
  Function2();
  return 0;
}

OurFile.hpp

#ifndef OURHEADER_H
#define OURHEADER_H

void Function1();
void Function2();

#endif //OURHEADER_H

OurFile.cpp

#include "OurFile.hpp"
#include <iostream>

void Function1()
{
  std::cout<<"Function 1"<<std::endl;
}

void Function2()
{
  std::cout<<"Function 2"<<std::endl;
}

[Lordieth]

Hey, thanks for that

It compiled and ran correctly, but still got this compiler error message:

1 [Warning] `nul.gcda' is not a gcov data file

Strange.....

[Valmont]

In that case, I'd go to the Dev-Cpp forum and ask dev cpp specific questions there. I personally never encountered this problem so I don't know.

[Lordieth]

Well, i've used this method to sort out my multiple file problem, and it seemed the problem wasn't my files or using the .h file and whatnot - it was that:

A) one function prototype was missing a ";"
B) I forgot to declare namespace std; in my functions source file




But i'll be using this new method from now on, as it looks a lot neater. The error just seems to be another silly thing Dev throws out - it can be pretty silly like that - cheers again.

[Valmont]

Ah, glad you figured it out. Here is a little tip: don't add "using namespace std;" in files. Every file that depends on it is forced to use the same namepspace. This defeats the purpose of namespaces. Since you are looking for a new style, I'd reccomend to always type std:: explicitly like I did. It's more typing but at least it is correct. Good luck!

[Lordieth]

Thanks again - advice taken on board