Code::Blocks Undefined reference error

[Jhuyt]

Hi everybody

I've been getting a very strange error when I use codeblocks, the "undefined reference error. Now if I was using a library which I hade to link to I would understand why I would get this but I'm just making an incredibly simple test class.

The code:

Test.h:

#ifndef TEST_H_INCLUDED
#define TEST_H_INCLUDED

class test
{
    int a;
    char b;
public:
    void set_int(int i);
    void set_char(char c);
    void show();
};

#endif // TEST_H_INCLUDED 

Test.cpp:

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

void test::set_int(int i)
{
    a = i;
}

void test::set_char(char c)
{
    b = c;
}

void test::show()
{
    std::cout << a << "\t" << b;
}

main.cpp:

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

//using namespace std;

int main()
{
    std::cout << "Hello world!" << std::endl;

    test t;
    t.set_int(4);
    t.set_char('b');
    t.show();

    return 0;
}

It gives me the following error code:

Undefined reference set to 'test::set_int(int)'
Undefined reference set to 'test::set_char(char)'
Undefined reference set to 'test::show()'

The strangest thing is that this code will compile in visual studio.

Any help will be appreciated :)

[zb0S216C]

Try cleaning your project, then rebuilding it. It that fails, create an entirely new project, and include those files.

_Wazzak

[Jhuyt]

What do you mean with cleaning it?

[zb0S216C]

Basically, it removes any invalid data (such as files & cache entries) that once pertained to the project; thus, purging the project of all out-of-data information.

_Wazzak

[Athar]

Build/Clean.
You have to add files you want to be compiled to your project.

[Jhuyt]

Tried it and nothing happened.

I know that creating a new project won't change anything since I've tried this in three other projects with different classes and the same errors keep coming up.

It will however recognize that the class is there because if I change the main function to this:

int main()
{
    std::cout << "Hello world!" << std::endl;

    test t;
    /*t.set_int(4);
    t.set_char('b');
    t.show();
    */
    return 0;
}

it will work.

[Athar]

Of course, if it failed to include the header file, you'd get a preprocessor error.
See:

You have to add files you want to be compiled to your project.

[Jhuyt]

Even if they are in the folders of the project?

[Athar]

Yes. Always create new files with Code::Blocks, so they get added to your project automatically.

[Jhuyt]

But I did create them in codeblocks.

Anyway, how do I add them to the project then?

EDIT: Yay it worked, thanks a lot :)

[Athar]

Project/Add files?!

[zb0S216C]

On the workspace pane, on the left-hand side, locate your project. Right-click it an select the Add files... menu item. Code::Blocks will automatically organise your files based on the extension.

_Wazzak